I was looking through the Grizzly catalog and came across the Shop Fox F-style clamps. The bars look similar to the Bessey Tradesman style and I love the few that I have and need more but they are priced quiet a bit high. Has anyone ordered the Shop Fox clamps and are they any good. I have a few f-style cheapos that I picked up from Rockler and other places with the smooth bars they warp with any kind of really pressure.