Like others have mentioned, my WRV works well, I have had no issue with staining and as stated above, it may have been a defective batch of WRV’s.
My home has wood, area carpets, carpeted rooms, and tile. some area carpets are about 3/4 inches above the wood floor and the WRV does not have an issue with that. Does a really great job of cleaning. I should note, I don’t have animals but I do have 2 grand kids a 2 year old and 5 year old which things can become messy - WRV takes it in stride and cleans the mess up easily.
You get many features with the Vacuum including Multiple Floor maps and soon Alexa Integration. Wyze is also working on Spot Cleaning ability - read this somewhere in one of the topics.
Only issue I have (but infrequent), but even the other Vendor Vacuums suffer from this at times, is depending where it is cleaning, the map tends to adjust and the vacuum starts to clean to the adjusted map. But as said, this is infrequent and seems to tie to the WiFi strength.
I would recommend the WRV based on my experience and review of other competing vendors Robot Vacuums. Price to Features is worth it to me.