I've used both Klippermate and the Gamma flying clamps. Prefer the Klippermate by far: much better machined grip. Easier to get on and off than the Gamma (I feel I waste a lot of time opening and closing them each time, and I have to use two hands to do it!). The Gamma's slip, and the "diamond" stuff wears out. The Klippermate's surface is smaller, but the action is much quicker and you can really dig into tight spots with them.