I've got a BB7 on the front as temporary measure, given the fluid seep I mentioned. It stops me fine, but the lever feel is a bit heavy (even with the return spring adjuster wound all the way out on the caliper - which I had to wind back in to the starting position to stop the outer pad working loose after a couple of mins). It's also a bit spongy, due to the cable outer flexing under compression.
If I could find a solution to this return spring issue, I'd probably just get another cable disc and sidestep all the hydraulic faff. On a side note, I was under the impression that BB5 were vastly inferior to the BB7?
Thanks for the STW summary - I find that forum a bit harder to navigate and search so don't spend much time on it. I'm not a downhiller, but I do enjoy the downs, so I'm after a brake that isn't going to lead to pumped arms any more than necessary!