I have been running a Polaris 380 for years and the aux. pump improves the cleaning. No problem with fine sand and other debris as I have a fine silt bag attached. Climbs walls fine and even gets into my steps. Has an adjustable nipple at the rear of the unit that can be set to help with climbing. I have a 41" deep shallow area and an 8' deep end and it cleans both without problems. If it needs repair, I take it to the local pool stores and they just charge me for parts, but the repair is free. Also, Polaris will take an older unit in for trade on a newer unit. Had to buy a new aux. pump recently, but has been an essentially maintenance free unit.