As for performance, on our first day back on the Calfee with the Avid rear disc I intentionally over-used the rear brake to accelerate the bedding-in process over our 30 mile / 2,300' regular loop ride from the house. By the time we were headed down the 8% grade into our community I was able to get the rear wheel to lock using only the rear brake. The following weekend we did an in-town ride with three other couples. For those who don't know, the city of Atlanta and its surrounding communities north of I20 are actually quite hilly in many areas. Anyway, as I did yesterday, I intentionally overused the rear disc brake and by about 1/2 way through the ride the stopping power was well on its way towards what I would call "normal" for an Avid BB7 with 203mm rotor. It had been over a year since we'd ridden our Avid BB7 equipped '02 Erickson and it was nice to have a really grippy rear brake back on the tandem. While we really don't need it for most of the rides we do locally, it's wonderful to have when we head up to the regional mountains.