I've bought a DD603SS on 8/22/2003, installed it a few days later on the weekend.
It cleans quite well. The Heavy Duty cycle heats the main wash to 150°F and the final rinse to 163°F (I believe the latest model revision has upped those temps a couple degrees). The spray is quite strong, it can easily upturn lightweight plastic cups and bowls if they aren't anchored. The motor runs between 2,500 and 2,800 RPM for recirculation, and 4,200 RPM for drain.
I find the loading to be quite versatile, and the drawers hold more than one initially expects. Large items such as cookie sheets, 11x14 baking pans, pots and skillets can be a bit challenging to arrange compared to traditional dishwashers, but I always manage to get them in. I can fit in my 16" microwave turntable by balancing it atop other items. Part of the trick is to think "inside the drawer" at how the water spray can get around, through, and between to other items.
That being said, DishDrawers may not be a good 'fit' for people who do a lot of cooking/baking unless they're not opposed to running smaller loads more often as compared to filling up a traditional dishwasher through the day . . . and if they don't have any pots/pans/utensils that really are too large to fit.
Here are links to a couple pics. The first one is a typical 'random-load, stuff-it-in' situation. The second is a posed picture for someone in another forum who asked about loading lots of bowls.
Random load
Bowls
And here are
a few more pictures showing some of the mechanism. The full-size version of the first picture got munged somehow and I haven't replaced it.