While messing about in the local velo workshop today I was offered a set of what I believe to be Avid TRI-ALIGN Ⅱ cantilever brakes. My past experiences with cantis have been mixed, so I'd like so info on these before I have them put on a bike. Does anyone have any experience with this (or this style of) canti brake? Do they stop well? Are they difficult to set up? Thanks.