Well I have a couple AAC (Advanced Armament CO.) can's and have been really happy with them. Their quality is outstanding! AAC home page
I had a problem, and they were really great as far as customer service goes, so much so that instead of buying the gemtech that I was going to buy I went back and bought another AAC..They were super helpfull there..
Have heard nothing but great things about Gemtech also. I've heard a lot of different brands of suppressors, and I don't think that the Surefire brands would be hardly any quieter than the other major manufacture's. I don't think a person could justify the extra money, but I could be wrong..
Meister does have more experience than me in this dept, so his comments on surefire carries a little more weight than mine.
There are a lot of differant makers of cans out there, just stick with the big names and you'll be fine.
SWR.....shot their Thundertrap on a .22 mag this morning..impressive, but heavy.
hope that helps a little