I just got my pair yesterday. I was a little reluctant never having put a pair of truly tight shoes on. I wear a size 41 Birkenstock and I got these in a size 37. I have been told that they do stretch out a little but not as much as their brothers the cobra. I am excited to try some harder boulders and some harder sport routes now that my shoes are actually tight. Something I have to say though is that unless you know the exact size of the shoe that you want.
How do these perform on things less than vertical like slab climbing and crack climbing that is 90 or less degrees? Or are they more of a gym climbing shoe and steep sport and bouldering shoe?