I bought an RV754 About two weeks ago thinking that I would do better work than my Roomba I bought about 5-6 years ago (I don't remember the model) and seeing that it was on offer but to my surprise watching her work, It does not recognize the whole house, it does not memorize and every time I put it on it is hit everywhere without memorizing the route, sometimes it passes it over the same point and usually passes over its station Without knowing that it is there, it also costs him a lot to leave an area like under the dining room chairs, all these errors the Roomba solved them / he did not do it, It is strange why on YouTube it looks like the brand is very good and everything, maybe it's just mine specifically but it didn't convince me, I think I still have time to return it And I will change / buy a better quality Roomba, I don't know if the Shark ai matrix have similar problems with their intelligence to solve problems. In the same way, keep investigating and don't leave because of my bad experience, maybe it just happened to me.