Does your pool have a deep end or is it pretty flat? Many of the lower end robots and even some of the higher end robots have trouble making it up a steep inclines especially when the bags are full. I have the equivalent iRobot model of the Aquabot Turbo T-Jet. It is not really "high priced" at around $600 but has more power than a "budget" or level bottom AG cleaner. When the fine silt bag gets lined with silt it rarely makes it up my steep incline from deep end to shallow end. That is one thing to keep in mind when looking for robot cleaners.
Another thing is what kind of debris it will mostly be picking up.
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