Might want to do a little research on the Titan over at Candlepower Forums. I think the concensus is that it's not the out-of-the-park homerun you'd expect from SF.
i believe those negative comments were mostly about the lens o-ring and LED not being perfectly centered/mounted, plus some flickering issues, in early versions. i'm under the impression the surefire has since fixed those problems and replaced all problem units.
the other major complaint is that the 300-lumen burst mode doesn't give a full hour run time as stated in the sale literature (not that i've ever needed that much power for more than a few seconds/minutes).
here's a link to a good 12-page CPF thread on it:
http://www.candlepowerforums.com/vb/showthread.php?407689-TITAN-PLUS 
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