Our builder installed ours last week after the month long wait and endless brushing of our new plaster pool. I noticed it wasn't cleaning the whole pool and wasn't climbing the walls at all. After reading the manual and making some adjustments (directing the returns downward and toward the middle of the pool, and adding the proper lengths of hose) it now gets everything with the exception of the stairs and the swimout bench. I asked several pool stores in the area and our pool builder, they all recommended the G4 saying "it's a great cleaner for the price". They also touted the fact that it has "only one moving part".
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