I have tried set #1, #2, and #3 of the "10 Small Simple Crimps." These are my favorite. You get a greater diversity of hold depths and incuts than with the other sets. You get small, shallowly-uncut holds for nail-biting crimps and some more positive edges for bigger moves or rose moves.
Rather than the crimp being just a tiny edge that forms a crimp against the wall, these holds features a lip or crease set into a backplate. It sets it apart from the other crimps I've tried. I don't know why, but it's nicer to crimp into the hold's plastic backspash than to be crimping against the textured back of your board.
I bought this as a 1-color set and use them for setting 12-move endurance crimp finger strength problems maybe V3 to V4 at 20 degrees overhanging. I have also set a couple 4-6 move V4/V5 problems and you could definitely set problems easier than that. They're a wonderful, versatile set for not-very-steep boards. I've tried a bunch of crimps from a few different brands. These are my hands-down my favorite. Get yourself some.