A self-important bonehead started a thread on the Gripboard to compare formulator workouts. It looks like there are 6 owners so far of the formulator.
Do yourself a favor, save your money, get a few sledgehammers, make a formulator (it will work just as well) and do some thick handled dumbbell hammer curls.
Here is a link to get you started on some EXCELLENT Home-made stuff:
GRIPPAGE