I bought several sets of these crimps to form the basic foundation of my 50º wall. The hold set itself offers a solid range of depth and in-cut allowing them to be used effectively rotated at any angle, not just down-pulling which can often be the case with a lot of crimps, especially at steeper angles.
Problems can can be set anywhere from v5 to v9 depending on the rotation, placement, and foothold used. This is really valuable for easing into steep boulders around the v8+ range as it can shift difficulty away from *just* pure finger strength to other areas like core, contact strength, and shoulder engagement. Don't get me wrong these holds will require foundational finger strength at 45º-55º, but allowing for you to build boulders with the goal of targeting and working on other weaknesses you may have.