I had a pair and agree on that the heel is shite. If you got a slightly narrow heel don´t bother with the V10. Another really anoying issue is the rubber band around the heel. It broke after just a few weeks! I sent them back, got a new pair and the same thing happend again. I know other climbers experienced the same thing.Now I am the happy owner of La Sportiva Venom. Fits like a glove :D
I'm pretty sure that needle sports on keswick has the v10's in, so crap heels you say, how would they compare do you reckon with the scarpa vortex, which is along the same lines and a shoe which i love dearly but why violet these look snazier by a mile http://www.scarpa.co.uk/rock/vortexle.html