Bought some Dubuque bar clamps. (Been on a binge lately with clamps.) First impressions:
* Fit/finish are good. The parts move along the bar smoothly and lock into place tightly. Some of the welds could have been ground "prettier" but so what ? - it's a clamp.
* The bar is rock solid. In practice glueups (all dry - no glue), I couldnt get it to flex at all.
* I was concerned about the effectiveness of the butterfly handles. They turned out to be easy to tighten. I was able to excerpt as much clamping force as I needed. I did not joint the boards and the joints were very tight.
* The panel was easy to keep flat and square too.
These clamps really do live up to all the hype - they are nice tools. I'll gladly buy more if I need them. They were right at $24 each, for two-footers, including tax/title/licence.
Fred