In reply to bogpetre:
Wrt to the fit, they are low volume in all aspects. They come up about half a size short in length (a 26 is actually a 25 and a bit). The have a fairly low profile, so the top of my foot, with all the blood flow, was proper tight up against the ceiling of the boot. And they are probably about 99mm last where it matters. Not sure what last they advertise, but that's what I recon. As for blowing out or shaving off. I wouldn't, they are very lightweight material with not much to spare. No custom fitter shop would touch them.
I've not climbed in them.