We love our Shark Ion Robot® Vacuum! Makes vacuuming a breeze! Unfortunately, could not get app for my particular model, a big minus for me because I  cannot control it when I want to. It is a great machine though. Cleans well and covers all areas eventually. The wheels are big with deep tread - does not drag around throw rugs but goes over them as it should. Emptying is easy; I empty it every 10 minutes because I have a hairy dog! The hair does not get stuck around cleaning wheel making it great for cleaning up pet hair!!!