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@Smallfurry
Might be something in the CX thread. But the thing with mechanical disc brakes is getting them set-up nicely. Due to the fact that only one side of the caliper actually moves. Add to this the fact that your road lever doesnt have half the adjustability of a BB7 mtb lever ( I have some, they be aces), and you need all the help you can get. As far as I know power and modulation are theoretically the same for BB7 and BB5.
Loads of people have upgraded 5 - 7. So someone should be able to give a better answer.