The clamps enable you to create a press at home or in your studio. They are pretty easy to set up and use and they do hold the screens quite stead in position to print.
I set the clamps up on a separate board instead of on my work bench as I feel that the clamps would get in the way when I won't be using them. I also thought it would be easier to readjust the the clamps to suit different screen sizes.
Overall the clamps are a great addition to my studio and make a large print run a lot easier to register. However I did find that the clamps did get a bit stiff after a while, and I needed to apply some oil/grease to loosen them up.