Having tried brakes and comps on everything from 8" 9mm subgun/pcc's to my FN Scar 17, I moved away from comps for a few reasons. Training in close quarters in buildings and around cars will definitely wake you up real quick with a comp.
The other issue I have personally seen training newer shooters as well as taking the ladies in my life, the tend to dislike anything with a comp as the concussion and noise distracts them. If a comp suits your needs I would say go for it, but with proper training and technique is what you gain from a comp really worth the trade off in the noise?