The first three models it seems, since I didn't see or read a difference between any of them, are what we have here at the apartment. They work good, but even without the automatic tempurature control the machines have, the hot water in the laundry room was never hot enough, even with the Speed Queens we used to have, and the hot water pressure SUCKS! The hot comes out warm, and a warm wash is like almost cold. So that's why I sometimes venture out to a laundromat, for an actual hot wash and so I don't take up all the machines at once like many people do here. I am surprized to see that Whirlpool finally decided to rev up the spin RPM to appx. 640 rpm.