Had been looking for a robot pool cleaner, my son's mother-in-law had gotten a Nitro Wall Climber last year, one of a few I had suggested to her, and was very satisfied with it. I ordered one this year to replace the old pressure side cleaner from Pool Supply World and got it in 4 days plus their price was $503.90 including the caddy and shipping, which was the cheapest on the net. Son's MIL used it all last season without any problem, so she was my test case. Will see how it cleans this weekend. :-D