Noticed a few peeps ride BB7's.
Cheaper than hydraulic...yes
But are they any good?
Your experiences are most appreciated.
You can use your existing V-brake levers (or STI units if your bike is fitted with them) when you upgrade from V-brakes to discs.
Yes they are good. I have swapped all my modern mountainbikes (and the retrobikes that have disc brake mounts on their forks) to BB7s from hydraulic brakes. They are as powerful as just about any hydraulics I've used, and the feel can be tuned by altering the cable leverage ratio at the lever (XTR levers, Avid levers, etc).
For me, the most important thing is they are easily "field servicable" - ie if you get hooked up on a branch, or crash and pull the actuating mechanism (cable in BB7s case) apart, you can fix it. If you pull a hydraulic hose out, and lose fluid, you have little hope of making a good repair. I guide each summer in the Rockies, and this repairability has led all the ride guides I work with to swap to BB7s.
Summary - I think they are great.
'92 Breezer Storm, '92 Breezer Sky, '93 Merlin Mountain, '94 Ibis Mojo, '96 Breezer Ignaz X, '97 (or is it '98?) Breezer Twister, Sunn Team Ti road bike
***Proud to be ordinary***