I love 5.10 shoes and as a woman I usually stick to shoes made for our feet but I've seen many girls with these shoes and they loved them so I tried them. I wear a 38 in my Miuras and a 39 in my anasazis but I ordered a 38, 38.5, and 39 in these and they were still extremely painful. I can slip my foot in the 39 but can't stand up. I have a little extra space in the bottom of the heel as well. I really want these shoes so I'm going to try them in a 39.5 and if they don't fit I'm just gong to give up! Overall they are a great shoe (my boyfriend has them and loves them, he went from his blackwings to these and sees a great difference).
This are great shoes! They really improved my climbing coming from my Evolv Defys. They could edge credit cards, the rubber makes smears super grippy, and the turndown really adds precision. My only real issue is how difficult it was to come up with a good size. I wear a 9.5/10 in street shoes and a 10.5 in the teams barely housed my whole foot. I ended up needing an eleven to keep from crying every time I put them on.
I've been climbing for several years now and recently picked up a pair of these. I initially spotted them because they are the coolest looking shoe I've seen in a while. Couldn't be happier with their performance. These are the perfect competition shoe for anyone seriously into bouldering or tackling really overhung sport routes. Tight around the heal with super sticky rubber. Might not be the best shoe if you need to wear them for long periods of time as they're definitely not the most comfortable shoe I've worn. I would size to your street shoe also. I sized exactly on with my street shoe and can barely get them on and they squeeze super tight (again, the perfect comp shoe). Love them!