Oh, we love our pneumatic squeezer, such a pleasure to use and consistently repeatable results. If you do decide to buy one, steer away from the cheaper Chinese versions, go straight for this one:
Yea, it's not cheap, but worth it.
We started off with one of those $350 Chinese copies (came with a toolkit) and thought that we just weren't good at it, it was so bad we went back to the rivet gun. Long story short, you get what you pay for.