In reply to And Climb:
That's really interesting. As mine are currently worn very thin/soft so I suspect it'd take a lot of getting used to if they came back very stiff. One of the reasons I've found the 5:10's hard is that I feel like my feet are wooden in them - that and OWWWW!
On the order form they also offer Vibram XS 2 but in 4mm rather than 5, which may be worth a thought if 5mm can feel too stiff. They also have 5:10 Onyx 5mm, just to add to the confusion. On the website it just gives the 2 in the OP title or I'd have confused folk from the outset.
Not sure how relevant this is but the things I find trickiest is the border between an edge and a smear (small lumps...) and I climb mostly indoors, some textured features, would like to get out more though.