Back in March I scored a deal on one of these (thank you again Blake) and it was finally approved back on 08/17 (paperwork came in 08/24, I picked it up 08/25, got to try it out 08/26). Going into it, I know it's not a top of the line can and I know what to expect out of a centerfire rifle can. All that being said, I was more than pleasantly surprised when I tried it out (comparatively, I've shot the 762SD on both 762 and 556 guns previously, I like the sound of the YHM can better).
Blake was kind enough to let me switch the mount out from the 7.62 flash hider to the 5.56 (1/2x28) brake. So I grabbed one of the only options I have/had at the time (16" AR) and toss the brake on. Sunday I go out to try it and fire a few rounds (Federal AE 55gr FMJ circa 2000) with just the brake, it's loud as hell of course
Then I toss the can on there and man does this thing sound good. Mind you we're still talking 5.56, haven't tried it on a 7.62 gun yet (couple guns are being threaded, then need to pick up mounts for everything). But anyway, it sounds pretty ridiculous for a rifle can, took off my earplugs for a couple shots and it sounded great...nowhere near a suppressed 22, but who would expect that outside of somebody shopping for a Depot can 
Of course there is the weight, but I knew that going in and I don't mind it. Depending on the gun, it will balance out ok still, but if you want something light grab the titanium version, definitely much lighter (had the chance to handle the 762 and 556 version at Blake's). But for about half the price, I'll take this one (again, I got a great deal on it)
Anyway, my $0.02, I like the thing and will probably look at buying another at some point.
Interesting thing Blake pointed out, he says that the Liberty QA cans will use the YHM mounts (but not vice versa).
Whatever that is for, maybe I will switch it out, maybe I will just deal with it.