Interesting thread. As an owner of an Aquabot and Pool Rover Plus in the past, I always wondered if I would have done better with a Dolphin or Tigershark, etc. The Tigershark intrigued me because of the filter cartridge sounded easier to deal with than a filter bag, but haven't ever read from someone who has used both to compare.

As for the "computer" controlled steerign, I am also very skeptical. As far as I can tell from the aquabot, all it really does it go back and forth, and relies upon the weight of the handle to move sideways at the waterline before, going down in a different area. Then, as it fills up with crap in the filter bag, it spends more time cleaning the bottom of pool due to added weight. I see no sign of anythign sophisticated. Anyhting that disrupts its movemetn on water line, like steps or certain corners can disrupt its "plan." That said, when it didn't get stuck, it did have a better chance of coverign pool than my pool rover plus, which apparently can't handle an oval pool.