I run the robot about once a week--I don't have overhanging trees. I have a Blue Diamond but I have to pull out the ladder to use or it gets stuck under it. That is very fast and the foam rollers don't seem to damage my liner.

I also have a Dolphin Dynamic. It's the second one--they couldn't fix the first which was less than 2 years old. The Dolphin is much slower than the B/D but when it works (and so far the new one always does), it works extremely well--and doesn't get stuck under the ladder so it can stay in.

Don't believe the hype. As good as the B/D is, it's designed primarily for rectangular pools--the remote is supposed to be how you handle other shapes. The Dolphin's remote allows you to set the shape.

But if you did into the threads you'll see stories and histories some of us have had--and you'll see how they ended up replacing my Dolphin.

Still, the Blue Diamond is, for my pool (a rectangle) generally a better unit even with the inconvenience of pulling out the ladder.