Yeah it's a pain to drill...the stuff work hardens so quick that if you stop drilling you have to break through a little layer of hardened Ti to finish the holes....makes lots of bad cruchy sounds when you drill it. If I remember my rules correctly...Ti likes a high feed rate...low feet per minute....on a drill that means low rpm, relatively high pressure.
It's a blast to grind though....lights up the whole shop. I only use it for the occasional brake stay or bracket that I want light, but stronger than aluminum. But..once you get the part made....they rarely break, never rust, never corrode and you can use a propane torch to get them to turn neato trick colors.
JohnnyB