Well I ran my Blue Pearl yesterday for the first time and I believe I also have the 2007 model. It shut off after about 2 hours.

Seemed to get most of my pool and was much faster than the Dolphin. Way more powerful as well. One problem I saw was it would do wheelies occasionally when coming down from the wall transitions. I have a 35 degree or so slope in the deep end and I saw it ride the back tracks and almost flip on its back when it reached the bottom a couple of times. Like it was too light. Cleancloths is that what you meant when you said you saw yours tumble? Other than that it seemed to do a good job. Most of the pool was cleaned in one cycle, 85% or so, with the only missed spots in the shallow end... Still not sure if I'll keep it or not, I have another week to decide.