The rubber cable boots stay in place all the time unlike the competition. Get em, you won't be sorry. These brakes are simple, no things that flex or bend and a very smooth operation. Long enough levers for gripshift users. Dead-dog simple, no weird linkages to wear out and get sloppy.
None come to mind.
Test rode some Avids and Shimano XT's. Hard to imagine improving on these. The feel is just right, they stop the bike, they don't squeel, they're light, they even look good. Hard to go wrong with a set of these pups. I've tried friends' Shimano setups.