theMJFwrote a review of Scarpa Booster Climbing Shoe - Discontinued Vibram XS Grip on September 25, 2012
Familiarity: I've used it several times
These shoes are great. I find Scarpa hug my feet like no other brand can. Snug, consistent foot contact all around, but never painful (except the first two sessions - can't do much about that). They perform very well and look pretty good too, if that matters.
Sizing: I wear a 10.5 street shoe, size 44 Scarpa Vapor V, and 44.5 Scarpa Booster. All fit beautifully. No need to cram your feet into something so small, you can't feel the holds.