These little rascals are expensive for what they consist of.  I happened to buy three different brands in a short period, thinking that they should all be generally the same--they are not.  The quality of the wood, how the parts are attached and the beefiness of the screws set this apart from the other two.  I was surprised that the Bessey product was rather cheaply made in comparison.  The differences might not be so apparent unless they were side by side.  These get used frequently in my shop and all three serve the purpose, the Jorgensen just a bit better.