I am looking into a robotic cleaner for my inground pool. I have narrowed it down (I think) to one of the above. It seems what I have read since joining 2 days ago, that the blue diamond is popular. I have a 6 inch ledge around pool, about 3 feet down. The shallow end starts at 3.5 ft and slopes down to 7 ft in the deep end.I wonder if a cleaner would get hung up on this ledge or not do the walls all the way around. Thanks in advance for your input.