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Friend of mine had one ages ago from XACD or whatever they were called and it snapped. You also have to be very careful specifying stuff - they will build exactly what you spec. and won't assume anything. If Ti appealed I'd probably go with Burls, I think Bike Whisperer has a relationship with them. But I just don't get the material. Steel, alu and carbon all work for me and Ti always seems like an expensive option for little benefit (if say looking at a Kinesis alu frame vs. their Ti ones).
Benefit of Titanium is that you can get custom to your exact spec for very good value if you go the Chinese route. They'll build whatever you ask em to