Hayward Shark VAC Pool Cleaner
If you want the best bang for the buck robotic, then the Hayward SharkVac Robotic Pool Cleaner is the one for you. Although it may be one of the lesser expensive units on this list, it cleans almost as good as the top rated models in both above ground or below ground pools. It may have difficulty with leaves, but in every other aspect, for the price, it works great. It is fast, the filter housing is on top, so you don't have to turn it over to clean it, and it will climb walls, but it won't do stairs.