One problem that has always seemed to plague people with QD suppressors is that you are stuck with the muzzle brake that is built into the QD. SilencerCo. has their line of MAAD series of muzzle devices that attach to the MAAD system, such as a suppressor, flash hider, muzzle brakes. The Saker series devices can also be used with the MAAD system.
Personally I would love to see more universal QD mounts. Just like 1/2×28 is the thread standard for a 223/556 rifle, having a QD system become a standard would aid in the development of more QD muzzle devices that can be attached to the muzzle in the event that you are not using a suppressor.
Here is the info on the new MAAD Brake from SilencerCo.
The MAAD Brake, when combined with a MAAD mount, provides the user a fast attach and detach muzzle brake system to fit over existing SilencerCo muzzle devices. The MAAD Brake also accepts the Silencerco MAAD Cap series of accessories giving the entire system the same modularity as the Saker series of sound suppressors without any NFA restrictions. Includes MAAD Brake, MAAD Mount, Flat Front Cap, and a SilencerCo muzzle device (Trifecta Flash Hider or Trifecta Muzzle Brake).
If you are interested in a MAAD Brake, head on over to http://www.silencerco.com/