Probably not what you're looking for, but I had three Shimano 10-speed 105 5600 series rear shifters go bad, each at about 15,000 miles. A cog on the ratchet would wear out, so it would skip a gear. On my other bike, a new Shimano 9-speed Sora rear shifter totally jammed at 6,000 miles. Warranty replacement. Would love to hear about SRAM reliability. So far all I recall is that the shifter "paddles" would break (Rival?).