I would definitely like to know where I can get one of these tools with the finger trap gripper. The one I got at my FLAPS is the one I linked above, and the one Tim linked too. Is has a jaw-type clamp, which caused us trouble due to it messing up the seal's weave.
I also agree with what truckernix says -- once the seal gets going it seems to pull through relatively easily, until, of course your puller tool breaks like mine did!
So I would appreciate it if someone could find one of those finger-trap style pullers online. This would be a must-have tool for this job, I think. If I find one I'll post a link in this thread.