Whatever you do, do NOT get rid of this dishwasher! Wheels on racks are too simple a fix to throw out one of the best performing dishwashers made in the past ten years. You won't find a machine that can clean as well as that KitchenAid-Whirlpool does in half the time the new machines now do. With TLC, that machine could last a good 10-15 years from now.
I agree with John, I haven't been impressed with Miele's rack designs. In my opinion, Whirlpool has always had the best racks in regards to being able to pack them full and have spaces for oddly shaped items, and have the entire load free of a single speck.