20+ years with braces. I've had custom cast GEN2 (I think CTi bought them out), CTi, and Asterisk. I use my CTi snowboarding but wear the Asterisk dirt biking, mtb'ing and trials riding. What the Asterisk seem to have nailed over everyone else (at least a couple years ago this was true) is the attachment system. Trouble with CTi and everyone else's is that the straps tear the crap out of your leg. Yes, the brace socks help with this. The Asterisk corset method of backing is brilliant. Great support and doesn't tear you up at all.
The other thing I've liked about the Asterisk is they're made for moto, so the knee cap protection is spot on - part of the brace, not just a screw on cap or attachment.
The CTi and proper orthopaedic braces have the best ligament support though.