I trust your testing. Thank you for taking the time to look into this and validate my own experience (and my own disappointment 
).
@WyzeMatt seemed to say that in another topic on a couple of occasions. I asked if it was true that free person detection was done directly on Cam v4 and this was the response:
I followed that up by asking about notifications with on-device person detection on Cam v4, and he wrote this:
His answers are terse, though, and leave a lot to be desired, which is why Iāve requested some clarification, to no avail (as of the time of this writing).
Itās entirely possible that I misinterpreted @WyzeMattās responsesāand I have no problem conceding thatābut even reading them in context I donāt think that my understanding is unreasonable, and Iād still really like to see some official clarification from Wyze on this, though Iām dubious at this point that itāll ever actually happen.
I agree completely, and Iād go a step further and say that theyāre making huge mistakes with their marketing/messaging about features (and which features require an additional ongoing cost of the user). The inconsistency of the message is more than a little maddening.
That's one of the things that I really don't understand at all: Why are they sinking all of this upfront cost into devices that they can sell with this technology already built into it only to keep it crippled unless the buyer pays an ongoing additional fee?
To belabor the point even further, the āWhatās the difference between Wyze AI and Edge AI?ā Support article says this:
* Edge AI is only available on Wyze Cam v3 Pro, Wyze Cam v4, and Wyze Cam Floodlight Pro, and is powered by an on-board chip. A subscription to Cam Plus is required on Wyze Cam v4 and Wyze Cam Floodlight Pro to access the full feature list of Edge AI.
Where would I find the āfull feature list of Edge AIā? My inference from this statement is that at least some of the features of Edge AI are available on Cam v4 without a Cam Plus subscription. Does that actually include Person Detection? 
(Apparently not.)
Further down in the article is this, which Iāll break up and address in sections:
Why isnāt Edge AI free on all devices, for all detections?
Edge AI takes a lot of manpower and research to implement on each compatible device. While no longer a recurring cost to produce, the upfront cost of developing a device with Edge AI is high.
I donāt doubt the up-front cost to develop and implement this, and I certainly wouldnāt expect a feature āpowered by an on-board chipā to be magically available on older devices, but Wyze is saying that this is already in a camera that I have. That development is done, the cost is past/paid, and the product has been purchased. I just want to be able to use whatās been sold to me on this device.
And once developed and launched, Edge-powered devices still require ongoing maintenance, accuracy improvement, and optimization.
This same thing could be said of non-Edge-powered devices, otherwise Wyze wouldnāt be issuing firmware updates for any previously-released products. Iām not sure I understand the point theyāre trying to make here, because this ongoing cost isnāt specific to Edge-powered devices. This seems to be a specious argument, and I feel like Iām being generous by saying so.
Making Edge AI free on all devices, even if possible, would increase costs tremendously for our users - no bueno.
I get that. I understand that itās not possible even for Wyze Wizards to retrofit this technology on all Cam products. Expecting that would be ludicrous. What else seems ridiculous to me is spending āa lot of manpower and researchā cost upfront just to sell an apparently crippled productāa product with a marketed feature built into the device thatās presumably already there for me to useāand then withholding it for the ransom of recurring subscriptions.
It is, and I like the units I just bought, but if it hadnāt been for the recent sale I wouldāve just gone with Cam OGs (which were only $1 
less than the Cam v4s during the recent sale).
Incidentally, I did pick up a Tapo C120 on sale at the same time I bought the Wyze Cam v4s.
Iāve had positive experiences with other TP-Link products in the pastāI really like their Powerline adapters, and I bought their Kasa Smart switches (and have recommended them since) because Wyze didnāt have an equivalent product available at the timeāso when I was camera shopping and saw that this model received a PCMag Editorsā Choice and was on sale at a price comparable to the Cam v4ās, I decided to try one. Iāve played with it for just a couple of days, and these are some of my impressions.
What I like about it:
- It has free (without a subscription) Person Detection, plus others: generic Motion Detection (duh), Pet Detection, Vehicle Detection, Line-Crossing Detection. So far Iāve set it up in an area where only motion, person, and pet detection are likely to be triggered, and these seem to work reliably. It also includes several distinct types of Sound Detection (Baby Crying, Glass Break, Dog Barks, Cat Meows), but I havenāt attempted to test those.
- During setup the app tells you that the free trial of cloud services cancels automatically after 30 days. You donāt have to enable the trial during setup (I didnāt), and you have the option to do it later, but even then itās not a free trial that automatically converts to a paid subscription: They just cancel it for you at the end of the trial and you can decide later if you actually want to enroll and pay.
- RTSP is included and easy to set up. I was able to consume a live stream in VLC without any difficulty at all.
- Itās also easy to set a static IP address on the camera within the app. Iām comfortable doing stuff like that on my router, but if Iām already configuring other stuff on the camera, itās really cool to be able to configure this setting right there in the app.
- It has a longer power cable than Wyze Cam v4 (Tapoās 3 m [~10 ft.] USB-C vs. Wyzeās 6 ft. Micro-USB).
What I donāt like about it:
- I prefer the form factor of Wyzeās cameras in general (though the Tapo C120 kind of reminds me of Pixarās Luxo Jr., which is kinda cool, I guess.)
- Thereās only a single color (white) option.
- The basic notifications donāt include thumbnail images. (The app refers to āRich Notificationsā as part of the Tapo Cloud Care trial and subscription, so I imagine those would include images, but I havenāt taken the time to explore this.)
- I canāt stream video in the Google Home app, which gives the āThis video stream canāt be viewed hereā message. I can, however, use the voice Assistant to stream it to my Google TV, a Chromecast, and a Home Hub.
- I havenāt yet figured out how (or if itās possible) to filter events by type (e.g., person). I believe this might be a feature available with a Cloud Care subscription or trial. The AI-tagged motion events are easily differentiated from generic motion events in the timeline by color, though, so thatās pretty cool and kind of makes up for the lack of free filter.
I canāt speak to the antenna quality. I have the Tapo C120 set up in a place where I previously had a Wyze Cam OG, and the overall experience is pretty comparable in terms of video stream load time and apparent signal quality (though the Tapo definitely wins with the additional AI detections), including the color night vision with the Starlight sensor.
I havenāt looked into mounts, but given its cylindrical form factor I could imagine just measuring its diameter with calipers and throwing something together in Tinkercad (where I designed the mount for my Video Doorbell v2) if I wanted a semi-permanent window mount. Right now I have it hanging from a window shade bracket looking outward and itās adequate, but a mount would likely help reduce glare/reflections inside the window.
Iām glad I did. I donāt have any personal experience with the Cam v3, and I like my new Cam v4s, but Iām really impressed with the additional features available at base in the C120.
That may be the case for your C520WS, but thatās not a true blanket statement about all Tapo camera models. Right now the magnetic base of my C120 is whatās holding it to the window shade bracket so it can look outside. Tapo includes a metal disk and mounting adhesive in the package (as does Wyze), but their mounting disk has two screw holes and seems like it could be more secure.
I think this is 
% true, and given my recent experience Iām more likely to buy and recommend more Tapo options in the future. I still really like Wyze, and I was genuinely pleased to learn during the Multi-Camera Timeline View video that they became cash-flow positive earlier this year. I imagine itās difficult to run a company with the intention of disrupting an existing market, but if they donāt make the decision to keep pushing competitive features as a standard (Person Detection without a subscription![1]) offering in their core product, then companies like TP-Link are going to eat Wyzeās lunch.