Wow, there is a lot of information on which robot to buy , but it is all so conflicting. Will give my facts and see what everyone things. I have a 40 year old gunite pool, 25x50, in floor cleaning system, in a wooded area so get fair amount of leaves but not sticks. I am worried about getting a robot that will clean such a big pool and also micro filter the water (we have algae problems being in the woods). Also, the pool only has 1 return, so additional filtration is a plus. My pool walls are rounded where they meet my pool floor, which I know is helpful w/ robots to make the climb. No special zero entry or ledges, just 3 simple steps at one end. Need something that can cope w/ in floor cleaning system. Please help!