I bought these to use on my super steep (65 degree) wall. Most of them are incut enough to dig into even on that angle, but a few of them ended up on my 30 degree wall. They are big enough to use as hands but I haven't really used them for hands. Also, on less steep walls, they are big enough for beginners (in climbing shoes) to use them without having to worry too much about slipping off.
For the price, they are hard to beat for footholds for a steep wall.