I've got about half scattered on my 25 degree, and the other half used as fantastic compression edges and toe hooks on the lip of my 8x8 roof.
On the 25, these bad boys are tougher than you'd think. The edge is actually quite large, many at least a solid half pad, but the texture is velvety smooth, so you end up squeezing harder than you'd expect. Their somewhat organic shape also helps make for fantastic training movement for the great outdoors, e.g. they're not perfectly flat and even thickness, so you end up having one hand on the good spot and either very slowly matching into a bad spot, or training to trust the one hand and pull.
I adore these things on the roof lip, though! Great simulators for lip edges outside, add some hard toes without oppositional hooks or bicycles, and you have an amazing bit of tension training. Most helpfully, many of the edges had screw holds high enough that I could get a part of the hold flush with the edge of the plywood, while screwing into the frame. Made for very comfortable (but challenging) moves to the lip that were more interesting than popping to a crimp or a jug on the face over the lip.