I have had a medium for nearly a year now and it feels perfect on my 5'10"
here it is;

<8kg hardtail? coming up!

hmmm, carbon underpaints
sinse those pictures I swapped the fork out for a SID and it's much better balanced now
the ride is great, really whippy yet stiff. over small stutterbumps and cobbles, you'd be forgiven for thinking it is a soft tail. accellerates like nothing I've ridden before, although the stiff wheelset (Easton XCOnes) may have something to do with that.
Value for money I'd have to say you're paying a premium, you need to decide if it's worth it to you, you're in cheap titanium terretory here. I got mine in Canada but only because there were none available in Europe at the time, the distributor's prices weren't too bad (unlike Evil, for example).
The weight is not as low as they claim, mine was bang on 1500gr (Ibis claim 1350, i expect for naked in small) but that's still a good weigth for a bike stiff enough to singlespeed and race 4x on
the Jukebox (Ibis' name for their adjustible chainstay system) works well enough and has teh advantage that you can dismount the rear triangle for shipping in a small box (so avoiding airline charges) but for me it's over complex, slotted dropouts or one of the pivoting / slidey solutions would be both simpler and lighter IMO. Also, you need to take the crank off to get the lower bolt out so it's not something that you're going to do to fit it in the back of your corsa although with a shim HT2 crank this might be easy enough (I have an ISIS)
on the indy fab note, mate of mine has a custom titanium indy fab and when you look at them and ride them side by side, you'd say they're in the same league so perhaps the pricing isn't so far off afterall
if you want to spend less money, I'd have a look at the upcoming on-one carbon frames, which look like they're about to embarrass the market (yet again)