I got the 500 version based on this article from Wirecutter. Works well, but does require that we leave the door open for a while to let the plastic dry. Silent though. Most of the time, I can only tell it is running by the light on the ground.
I _just_ ordered a Bosch 500 series because my (barely 4 year old) GE model died over the weekend. I was told by a friend who owns the same Bosch model that they go through a lot of Jet Dry, though... But if it actually cleans well and doesn't break in a few years I'll be happy.