My Dolphin is still going strong after almost 3 years.

No problems. I have the remote model,but if I had to do it over again I am not sure it was worth the extra cost. I rarely use the remote feature.

I put the dolphin in the pool on the 6 hour cycle, but usually the pool is pretty much clean after about 2 hours. I have a 20x40 rectangle with steps and a ladder.