There's problems either way. If they replace it for a new one then I've got a problem with my existing headset because it won't fit and I'll have to spend out more money (is the bb the same?...haven't looked). If they do a pony job mending the frame and it breaks again, then I've got several more two hour periods of my life to waste taking it apart and then putting it back together again when it comes back. And then there is the postage and packing costs on top of that.
I didn't read the bit about it not being thought to be a good long term prospect, I talked to a metal worker/welder of long standing and he gave his opinion....admittedly he had not worked with Ti though. May be bollocks but that's what he said.
I've run it with Talas 32s, Pace RC41s and Pikes, all with 51cms axle to crown heights. I tend to think it would benefit from a higher front end so was thinking one of the newer 53.5cms crown/axle 150 forks might be better on it. I ride XC (all montain...wot's that?) but over stuff like the Lakes/Highlands etc. I have lent it out to folk who hammer the downs more than I do but no big jumps or huge drop offs.
Truth to tell I was getting a bit naffed off with it. I changed it round umpteen times, but never realy got it going totally to my satisfaction. I had kinda migrated through a Sanderson Blitz back to my Pace 303 for most of my riding these days, both of which I think are probably more all round fun/capable than the Ti456.
I'm thinking (among several other things) the BB was too high, the seat angle too slack (does my knees if I don't have the seat foreward), the chain stays didn't have enough clearance for 2.35 Nevegals and they should have gone for a 4lb frame weight rather than 3.5 and made the frame sturdier.
Strangely I'd probably keep the steel 456 I've got above this one.