I had a pair.. one of the levers packed in after 2 months, i found them very messy and a nightmare to bleed .. but that might be more to do with me than the brakes, but in saying that Ive bled a lot of different type of avids with no issues.. I had the 180mm rotors on mine, I could never get them to stop chiming.. got very annoying after a while.. even contacted Hayes for a solution, they said it had to do with a bad batch off pads so they sent me new pads for free.. never made a bit of difference.. as for performance, they weren't to bad but did fade on the longer descends.. a friend of mine has just got a pair from merlin.. he was on is second ride out with them yesterday.. he's already having the same issues as i did.. plus a sticky lever.. I was very glad to get rid.. i stick with avids.. i never have any problems with them and are very easy to bleed..