I've been watching robot vacuums for months but haven't bought them because a) the Roomba models are expensive and b) many other cheaper brands are me unknown. I have two regular Shark vacuums that I am very happy with, so I was happy to know that they are also available in this market at a price I can accept. I was waiting for this model because of the smartphone app (which works well) and the Alexa connection (which I haven't tried yet). I love love love this vacuum cleaner. I have a combination of wood and carpeting downstairs, it seems to move quite well although it tends to get caught in the thicker carpeting in my living room. I have two cats, one of which has a medium coat that produces clouds of fur on a daily basis, this little robot has no coat problems. And the cat filler is taking off, not perfect, but very satisfied. Self docking works well. I appreciate both the audible alert from the device and the text alert via the app when it gets stuck - when I'm upstairs I don't always hear it asking for help. Very happy with my purchase.