Funny, i have a Gemtech G5, one of my friends has the M4-1000, and another has the YHM Phantom. Out of our 16" carbines, the G5 was significantly more quiet thent he M4-1000 and a hair quieter then the Phantom. It also has the quickest detach/attach bi-lock.
That AAC video is propaganda, every suppressor fired rapid enough will eventually self destruct. When you need to unleash 500 rnds in 10 mins and not only 450 from your AR, then maybe its worth losing sleep at night.