I use Herm Sprenger prong collars, they are very well made and good quality. I have not heard good things about the quick release feature, but I have not personally had any experience.
I use the regular HS without the quick release, and a back up collar for safety.
Warden - Sable GSD 4/23/2013
Blackjack - Black and tan GSD 4/23/11-6/1/2012