Anyone tried these clamps?

[Bill Stock]

http://busybeetools.ca/cgi-bin/picture10?NTITEM=B1349

[luteman]

I have a set of those clamps. They are only as effective as the quality of the lumber used to make the crossbars;otherwise they work fine.

[cabinetman]

It's an interesting method. For the price they seem limited for the widths they can do.
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[Bill Stock]

I have a set of those clamps. They are only as effective as the quality of the lumber used to make the crossbars;otherwise they work fine.

Yeah, as CM mentioned, I guess width would be an issue. Have you used these for anything other than 4/4 glue ups? I was wondering about the strength for thicker pieces, as I see a lot of plastic.