+1 on the Cabinet Master clamps jamming. I have several of them because I use them to pad out purchases at the Home Depot when I want to use one of their $300 no-interest deals to get something that is less than $300.
That aside, the Cabinet Masters do work pretty well and if you get them prep'd before the glue up the jamming isn't a big deal. I just whack the handle with the heel of my palm and that usually unlocks it.
I have used the Bessie clamps, the woodworking guild I belong to has a shop and they have a few dozen of the Bessies. Nice clamps but the lower cost of the Cabinet Masters has been worth the minor hassles.