Their machining is incredibly good, so I'm sure these are lovely objects. They're kind of unremarkable, functionally, as flashlights, though. Three-mode UI, modest output. It's very functional, but it's a 2014 light, basically.
Titanium is a popular choice for high-end custom flashlights, but it's also relatively impractical. Titanium conducts heat poorly, which makes it pleasant to the touch (it feels "warmer" in hand than most metals people make stuff out of), but that's not a desirable trait on a small LED device that needs to dump heat on higher outputs.
Aluminum is the best all-around material to make flashlights out of, because it conducts height and is light weight. If you don't care about how much things weigh, copper and brass are better.
(Aluminum also has a useful trick in that most aluminum lights are anodized and the anodized portions are non-conductive, which makes it easy to break mechanically "lock out" the light. However, I think Surefire may be patent-trolling this.)