Do they work?

As long as you're using them on aluminum or wood, yes. At least, once you learn how to use them. There are some arrows that get bent so bad NOTHING will save them, but you can get most aluminums back to factory spec or better.

They do not work on carbon, fiberglass or composite arrows. Nothing can straighten those arrows if they're not straight to begin with.

Arthur,
Thanx,
I'm talking aluminum, started on them & I'm stubburn if something works well for me.
I was just thinking if they work then theres alot of arrows I been trashing that could be fixed up. I figured really bent ones are shot but theres alot that are just a bit tweeked I wont shoot that should be fixable, if these things work.