This is a link to my first impression.
The features have gotten even better since and the team is still working on improvements. (Multi Floor, Voce Commands with Alexa, spot cleaning)
I really like my WYZE Robot Vacuum I use it multiple times a day on hardwood and carpet.
I have not had an issue with the wheels staining my floor either. The only issue I have (and it’s minor) is the WRV disconnects from my WiFi once every 4-5 days for an unknown reason. The only way I can get it to reconnect is to reboot my wireless access point. The WYZE team is helping me try to identify the root cause of this. Other than that I am very happy with my WRV, Price point per features you cannot find a better device. But I would be mindful of the wheel staining issue that some are having.