Re:
Thread revival! Well, I tried replacing my hydraulics with BB7s yesterday and . . . Meh! To be fair, they haven't been broken in properly yet but there are other issues. 1) Those red dials are no better than using an Allen key to adjust pad clearance. In fact, I'd rather use an Allen key: it's kinder on the fingers. 2) They seem to have a slightly spongy feel to them when braking which I'm not sure I like, though I might get used to it. And that's not due to the cabling because . . . 3) The moving arm on the rear one snapped as I loosened the cable-clamping bolt (that build quality LGF mentioned perhaps), so I installed a cheap Clarks caliper I had spare instead: no sponginess, same cabling - easier to set up too. Both are attached to SD7 levers.
As for performance: it's too early to tell but there's nothing remarkable about the BB7 on initial testing and set up seems a bit trickier than with other cable discs.