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Didnt think neither the stiffer springs were a problem (though TRP should have had a grub screws for the springs to adjust for rebound according to rider's preferance) nor the single actuated BB7 was inadequate, just for the Paul I would have expected something more build wise at that price.
I agree with you and the BB7 is still my favourite mechanical disc brake - easy to align to the rotor (as they have those conical washers), simple to dial in and maintain but didnt like the flimsy red adjuster on the outside which you do lose (this is from bike polo use) and the fact that they can seize up because of grubby internals partly due to the lack of bearings for the actuation arm (pretty sure you know this Ed, it's more for those who have never maintained a BB7 before and just get a new set when they seized up).
I have moved to hydraulics (Shimano M615) but I still carry the BB7 setup (yeap, lever, cable and caliper, spare pads too!) just in case I need a backup. For the price and what you get, the BB7 is bettered by none.
Problem is that the dual actuated pads is that they felt a little harder to pull, as if the return spring is really strong due to having two spring instead of just the one on the Klamper/BB7.
The old BB7 were much easier to modulated despite needing pads adjusting every once in a while (not really a disadvantage in my book).