i'll hold judgement - the heel on the latest V10's are pants - whilst they have no air pocket they dont grip the foot well and slide off the heel whilst you're climbing.
The best rubber available Medium stiffness sole Not too much toe downess (V10s let down by this) Good shape Medium sole thickness Good heel profile, with rubber all the way round (no gaps) and sufficiently aggressive to stay on during use. Some rubber on upper for toehooking
im currently using anasazi velcros, and good ole boreal stinger for the heelhooks.tried once testarossa and the feeling was truly amazing.
Did you cream your pants?