Heck yes, I do! I've come to prefer them to the Al lights BECAUSE they can be shined back up and restored. My Lunasol is my current EDC, its spare is my nightstand/checking around the house light. I carry a Quark Mini AA in my backpack as a backup and when I need more power, I pack my Ti Quark 2xCr123. To back it all up? I Lummi Ti Wee around my neck with two tritium vials. Did I mention all my Quarks (Al and Ti) have tritium vials in the tailcap, Lummi style? I don't think twice about getting any of them scratched, but when I bang up my Al lights, there's always a battlescar that I'm sure will rust if I don't baby it (rinse it off if I've been to the beach, that is).
Like Don McGizmo says, Ti is like a low maintenance mistress: she looks good naked. If scratches bother you, look elsewhere since Ti (especially highly polished like the Quarks) scratches more easily, but those scratches won't oxidize and the shell of the flashlight itself will remain intact. The threads on my Lunasols are smooth and buttery. I'm almost looking forward to sanding down the finish in my Quarks like I've seen some here do.
In summation, I use my Lunasols more than my Quarks mostly because of their smoother threads, deeper pocket clip, and one-handed operation. But yes, I do use my Ti lights. The only Al lights I use any more are Dereelights (when will THEY make Ti lights?!?!?!?!) and RA lights. I missed the bus on the Ti Clicky and I'm sorely disappointed. I knew I would be! :mecry: