Good to hear Joe!
If you do pick one up, I strongly advise playing around with a couple of test pieces to get the hang of it first. It’s easy to over shrink or over stretch if you’re not careful. The number of times you do it, the pressure you apply on the handle, and the placement of the piece in the jaws will all have an effect on what it does to the metal and where. Don’t expect much to happen with a straight, flat piece of metal, you’ll see the biggest effect on a piece that’s bent close to 90 degrees. That’s what they’re designed for, making them perfect for wheel arch lips and the like.
There’s also plenty of videos on SpewTube if you’re into that kind of thing. It’s a pretty cool tool once you get the hang of it!