Wow Randy, you sure have had bad luck with them. But if you were able to get your money back, you should be happy.
With two million sold, if only one percent are lemons, there's a lot of grumblers (ie 20,000). And the grumblers are the most likely to post. What's the source of your saying that 1.5 million have been returned.
I guess I've run mine about twenty times so far. It keeps finding lint and hair and stuff that I didn't know was there. I've had a few problems with it getting stuck under a dresser due to the the width of the legs. And a few times it's failed to redock probably because the dock is on the rug rather than a hard surface as recommended. It's fun watching it missing a dock and then turning around, backing up and having a full speed run at it.
It's four inches high so it might have troubles with some sofa's. Of course you could put a 2" bed riser under the legs. It also sometimes has troubles with the fringe on some throw rugs. Just take the usual prevacuum preparation if necessary ie. move chairs, roll rugs and get electrical cords off the floor.
I like having it working on my master bedroom and banging up against the door and things. I'll yell out 'Hey Buster, keep it quiet in there!'. My favorite brag is when I go to breakfast and tell the waitress 'I'm vacuuming my living room right now' She'll usually say that my robot is doing it. "Yes, but I pressed the button!"
I expect I spend as much time watching Buster work as I would spend if I were vacuuming myself!
I think that it's a perfect gift for wives or bachelors that hate to vacuum. Now if only they had one that would clean windows.
Randy, thanks for the link. Here's another link for an irobot forum
iRobot Home Robot Community
By the way, I'm vacuuming the living room as I type this.