Check rec.bicycles
Go to groups.google.com and run a search "group:rec.bicycles.* habanero". There's been lots of discussion there about habs, since Mark Hickey, head of Habanero, is a regular poster. Here are a few summaries from memory:
- welds are generally considered excellent, comprable to litespeed and merlin
- the tubes are straight wall, so not as light as the lightest ti frames, but really sturdy
- a little stiffer than most ti frames (perhaps because of straight wall tubes)
- ST and HT angles stay constant (73.5 degrees both) in all frame sizes, unlike most makers, who relax the ST and steepen the HT as sizes go up
- lots and lots of happy owners
- Mark gives *excellent* customer service
I don't own one, but am thinking about getting one, so I can't give personal experience.