iRobot Roomba 550 Bagless Robotic Vacuum Review

I was so excited when I got my Roomba:  "Wall-E" did just what he was supposed to do every day.  He picked up dog hair and kid crumbs an saved me lots of time.  I would leave in the morning, he would work while I was gone, then he'd be back in his dock.  My kids are afraid of the vacuum, but get woken up by it if I try why they're napping, so this was the perfect solution for our family.  After about 3 months,though, one thing after another went wrong with our Roomba: brushes stopped spinning, the lighthoused malfunctioned, the battery wouldn't hold a charge, etc.  I wanted to exchange it for a new one at my costco, but they stopped carrying them because of all the problems.  iRobot sent me several replacement parts, then a new robot, but it sucks (not like it's supposed to).  I will be returning it to Costco.  If it would have performed like it did at the beginning, I'd be thrilled.  It's a big chunk of change to pay for something that only lasts a few months, though.