Thanks for the review. I've also used the BB7's extensively on several road bikes, and had similar impressions as others here - they are good but they could be improved.
Because of this, I've recently been using Shimano's new cable road disc brakes, CX75 and R515. After a few months, I must say that I like these more than the BB7's. They have at least as much stopping power, and seem to need less adjustment and open a little wider to avoid having the rotor rubbing, while still having not much lever travel needed to engage them. I originally had them paired with my old Avid rotors, but I noticed a significant improvement in feel and power when changing to Shimano Ice rotors, so I would recommend changing your rotors at the same time as the brakes.
I'm using these on my touring / go anywhere bikes, so I'm still not convinced that I want any hydraulic parts on those bikes. Therefore, I cannot ignore the fact that the TRP HyRd relies on a hydraulic system, and have been searching for the best cable-only disc systems out there. So far, I'd recommend Shimano's latest offerings over Avid's. TRP also launched a cable-only disc brake around the same time as the HyRd (called Spyre I believe), I've not had a chance to try those myself yet but the reviews I've read of them were a bit mixed.