As a dealer, we have a relatively large concentration of Surefire sales in our suppressor line, but that is due to the fact that we specialize in military sniper rifles. The Surefire SOCOM series does a very good job at suppression reductions. Over the years, there have been other cans that are doing as well, if not better, and with lighter materials. As you mentioned, this Surefire is Titanium. It is very popular for those who have Surefire muzzle devices on multiple rifles.
It really comes down to your specific use case. I would encourage you to look at the CGS Hekate the the TBAC 338 line of suppressors as well. Those are hard to beat in that class of 8.6mm / .338, but you would not be disappointed in the Surefire, it will just not win all the awards and best sound reduction that others contend with. Then again, often times, at .338, you are shooting long distances where a db here or there is not as important as versatility or price (you said you got a good deal).