Last year I had an AG pool and used a "ladybug" I loved it, but her rubber feet ketp coming off, so I wouldn't recommend it.

I had an IG kidney shaped, 16x24 built (just completed - still need decking) and it came with a Kreepy Krawly. I've used it 3 days in a row now and I"m very amazed by this device, it climbs right up the walls and is very effective.