So just because it's undetectable means it's good? Usefulness is a relative scale. Compared to a lot of other card sleights out there, it lacks the versatility and utility of many other classic techniques. It's good as a color change, sure, but what else does it really add? There's nothing that the clipshift can do that can't be replaced with other, easier, and more versatile moves, save the color change. I have the clipshift down, and I use it in 1 effect. It's not very useful at all.