Most apparent is the fireball they shoot out of the end after they heat up unless using a reduced flash powder such as in m855a1.
I've only shot one of their cans on one occasion and they were louder than the traditional baffled cans we had around. With a tuned rifle that I only shoot suppressed a bit more back pressure for the trade off of flash and sound I'll take it. I just want to give them a second try because I currently am not a fan.
I get the quieter at the ear than the muzzle as well as the reason, that's why I want to try them again. Just didn't get that when I used one. Obviously I didn't meter it but still. I've watched the MAC video and wanted to get behind one again ever since.