Emil Dimantchev wrote a review of La Sportiva Katana Lace Vibram XS Edge Climbing Shoe on January 20, 2013
Familiarity: I've put it through the wringer
Sizing: In my experience (sport climbing in a gym about 3 times a week) these shoes stretch about half a size after 8 weeks. I got them one size smaller than my regular shoes, but I regret not getting them 1 and a half sizes smaller. I think that would be the ultimate feel in the long run.