Recently built an 8'x12' 40 degree wall to train during the pandemic. Purchased these for the wall, as geometric pinches tend to be some of my favourite holds, and these came with a lot of options for the price.
I'll be honest - on a 40 degree wall these are tough. I wouldn't expect to set much lower than V5 with these alone - however, swapping one or two of these pinches in at the right spots can make an otherwise straightforward V3, a nice and challenging V4 when combined with other less difficult sets. Needless to say, these work fantastically as footholds, and come with a diverse range of angles. Note that very very few offer a "positive" side to them, so they work as true pinches (or decent sloping crimp edges) in almost all scenarios when being set as handholds.
Overall a great set to fill out your foothold selection, or bring up the difficulty with some tricky edges / pinches.