I've been a can user for a few years and will never go back unless forced. The benefits far out way the negatives but there are a few. Sound suppression is more hearing safe for sure, mainly for hunting purposes, and the recoil pulse is changed. Recoil is reduced as most have an internal or adapted muzzle brake, but the pulse is also changed and it is a different feel then just a brake alone. I take my dog hunting and he'll lay next to me and go to sleep while I shoot. Without a can, he walks off quite a ways. That's a big deal to me.
Now cons.... they get hot as he!!, are dirty, and foul the barrel and chamber much faster than without. I clean my bore and chamber every 50 or so as part of routine maintenance and will clean the can when carbon starts flaking off and dropping out. That is the only thing that is annoying to me. Now, one other thing, for hunting, spend the money on a ti can. Some cans are ridiculously heavy. I run TBAC ti cans. Very light and very effective.