Miche has loose cogs (you can mix/match easier), they're somewhat heavy, I think some folks have had some of the smaller cogs crack. I have a cassette, no problems, but I haven't used it much. I'm going to be buying one or two more for training wheels, using lighter Campy cassettes for race wheels.

Next winter, unless something happens, I'll probably switch over to 10s Shimano/SRAM cassettes and SRAM rear derailleurs (while keeping the 10s Ergos). I tried it out on a bike, worked, but since I have some Campy cassettes left, I'll use them for one more year.

cdr