These tools are well made and straight as can be. I do however have one complaint about them. They lack the ability to adjust the spring tension on the clamping mechanism. For the most part this is not an issue unless, you want to clamp thin plywood or any other thin materials. It will cause some material to buckle under the clamp pressure ( I learned the hard way). Besides that this is a great tool but, without the ability to adjust the clamping pressure it has a few limitations. As far as an edge guide or straight edge it's solid as a rock. Now get out there and clamp away.