I really like it, I was just doing everything by hand with my bone folder before and you have to be so careful of your lines or you end up marring up areas a little bit, this system really helps with that issue. My bag is still really stiff but seems to loosen up a bit with each use. I have nothing to compare it to as far as using a press with gum rubber. All in all I am very happy with it.
I actually think it is the Vinyl bag, do you think you get a better form with the poly, or was the stiffness the biggest difference? I think it still works great, I just can't compare it to the poly. Do you get a better vacuum and form on the poly?