I have had a Premier for about a month now. Overall I would rate it "fair", a disappointment considering the price. It has trouble on my pool at the waterline, tending to "fall backward" due to the bullnose coping which protrudes about 1-2 inches as it meets the flat surface of the coping. Sometimes it can recover itself, but other times it floats helplessly until it reaches bottom, and then it is out of synch with its pathways, and frequently goes back to already cleaned areas. When it does stay at the waterline it tends not to creep along, staying in a 1-2 foot area at most before reversing. (I demo'd an Aquabot unit that did fine on my bullnose coping). It also does NOT do right angle turns to cover the pool as in Maytronics' demo on their site. That being said, it does seem to eventually clean 98% of my freeform pool, approx 20 X 40. This leads to the other problem, the remote. The unit starts and stops so aburptly in manual mode that it CAN'T be controlled for spot cleaning unless you get lucky. However, if you don't have the remote, you can't access the "quick clean" cycle at all... I also returned the first unit I got because that unit tended to follow circular paths (one side wouldn't seat on the pool floor and the result was lazy turns most of the time). The second unit does not seem to do this with any severity. Instructions are abysmal and an embarassment for a "top of the line" unit. Phone support from Maytronics was good with attempts to problem solve, etc. Leaf bag requires attachment of a screen to prevent the bag from impeding the impeller on top; NO instruction on its need or how to install. I would recommend paying a few hundred more and getting the M5 which seems to be a superior unit as described by all of you.