LBD - In a moment of misguided expectation, I bought 4 of these.  I despise them with a passion.  They seem to be a mediocre solution looking for a problem to solve.  When you try to tighten them everything goes to hell and you wind up having to re-position everything and start over.  They don't seem to hold well or provide a very tight clamp either. Twisting the handle isn't a natural approach.  You wind up fiddling with everything and still use a different clamp.  I don't like them so much that they went in the trash bin, but they hang directly over it so the trip won't be too far or take much thought.  

I think some development engineer had a few too many shots of espresso one morning and thought they were a good idea.  IMO - they aren't