I love this thing! Sure it takes about 10 times as long to get the downstairs vacuumed but it's one less thing I have to do. I run it daily and it seems to be learning the floor plan. I'm trying to think of mods for it. Needs longer battery life and more suction power and move speed so it gets the job done faster. I'm okay with the added drone if performance is increased. Carbon Fiber parts might be needed. Maybe some racing stripes? Magnetic dampers? My furnace has a filter that electrocutes some debris so maybe something like that in the Roomba's dust bin so it can go longer before emptying. Stock wheels and tires seem fine, good even wear and looking like I'll se some great millage.