Well they are sexy.
I get them on eBay at a good price often.
Avid Shorty 6 stops me fine but less mud clearance. Tektro 720 are also fine and easy to set up.
I have a pair of sexy Frogglegs in pink I can let go real cheap. Or a pair of black Planet X froggies when I get rid of my rando frame.
283 from axle center of studs and 80mm apart CTC.
I trust Goodrich.
Re canti brakes: what do you need them for?
I absolutely adore TRP Revox.
But to be honest they are shit brakes all of them. But they look gorgeous and sort of stop you :)