Totally disagree as do many, many others. Of the entry level stringers, the Klipper clamps blow the others away, IMO, because they're based on a proven tool. I have the Gamma clamps also and the Klippermates are much better and easier to use.
To the originator of the thread. All you have to do to adjust is loosen the nut locking the bolt in the handle of the clamp. Then, tighten or loosen the clamps to the desired setting using that handle bolt. Once you've done that, re-tighten the nut that holds the bolt. You don't have to screw around with the smaller pins at the top of the clamp. I think that's where most people mess up.
Just adjust the clamps as you would the vise grip plier tool. I've seen people post about how bad they are. Obviously, since Klipper has been selling them unchanged for so many years, they work and work well. I'd challenge you to find marks on my strings any time. I string mostly 16 gauge but switch and adjust for 17 g regularly. Just don't listen to the people that don't know what they're doing. Your clamps are great.