Last spring I put 10spd 7800 shifters and derailluers on my bike. The old 6500 shifters were wore out and had been on for over 10 years. 7800 stuff could be picked up fairly cheap on ebay since the 7900 stuff had just recently been made available. I find the 10 spd shifting is more succeptible to dirt and debris resulting in poor shifting. Last night I was at the LBS wanting to get a 12-25 cassette for a ride tomorrow that promises to be really hilly, $110! 9spd stuff is half that price. Now I'm cruising ebay for a pair of 7700 shifters. Grrr!