i have one kind like that like a jig on the bench where it stand stiffly, unscrew clamp the pcb and screw to tighten, looks charming for the "real man" at first glance, but practically i only used it once or twice during my purchase long long time ago, now its collecting dust. what i usually reach until today is my cheapo there so called "unhelpfull hand for unreal men", can twist or any orientation a pcb or any object i like. now my unhelpfull hand has a better carpet where it stands on, the jig type one, the collecting dust one. so thats the the morning glory story.