I have played them at the Chicago show and they sounded good, but nothing extraordinary. I will have a pair of Carbon Fiber shells here to build out soon. I'll try to remember to chime back in after...
I have heard and played The Ti shells and to me, they different enough from my steel shells to invest in one....
And just to throw another log on the fire, I played a magnesium shell. Even took it over to a buddies for us both to play and hear. To be honest, the mag didn't sound much different from his late model Black Beauty. Since I prefer my hammered Bronze to the BB or mag, I keep what I have...