I have these in the dry tool resin and train on these on my home wall. I can confirm they accurately simulate climbing outdoors, even on tools. And because they're crimps, it forces me to be very careful with my pick placement and pay attention to pick control. Like the large granite edges, they can be oriented differently, and each side is different. This might be my favorite thing about the granite edge holds, from crimp sets 1-3 to the large edges. There's a lot you can get out of them.