Product review (2 stars): randomly quits working at times (no the hopper is not full when this happens)
It never worked consistently, and after 2 months it quit working all together.  I think that the temperature sensor, which starts the ice cycle, is not calibrated properly or not good quality.  There was ice in the tray that never harvested, I took it out and let the ice melt, I re-installed the unit.  I adjusted the water flow down just a little and now it is making ice again.  This seems to be the same manufacture as the "certified Whirlpool replacement part". But it is not made by Whirlpool.