I have TBAC's and AAC's and a Sico Saker. For the best all around quiet can that won't see heavy abuse, the TBAC can't be beat. It's awesome for all but the most abused rifles. AAC has too many CS problems and they won't drop that goddamn 51T mount. I'm stuck with 2 SDN6's and 2 5.56 cans so I have to deal with it, but my Saker beats them hands down. Can take abuse and is easy on and easy off with nothing but gross motor control. No "twang!" with the flash hider, no ratchet teeth to wear out on the mount itself. It's even made out of better materials, AAC uses Inconel which is awesome but Sico uses Stellite --same shit they line M2HB barrels with.
Needless to say, any future "abuse cans" will all be Sakers (for now anyway) and for precision I stick with TBAC.
Edit: Got my KAC QDC back, FINALLY. Haven't shot it yet, but first impressions are excellent. Light considering it's all steel, indexing pin on the mount to line up the can TDC each time, ball bearings lock into the mount and it ratchets tight in order to lock down the bearings. Very well made, costly but a good candidate for future cans as well as the Saker and with respect to the hard use cans.