Ive ridden the ARGs, and yes, they do rip everything but groomers. I rode them on a semi-pow day at squaw, where we were still finding untracked areas, and it was snowing, and we hit some cliffs. . . etc. . . but getting back to the chair, traversing on trails, and stuff was a feat in its own. I found my leggs going different directions a few times.
I havent ridding the hellbents yet, or the EPs, but I want the hellbents. my friend who owned the ARGs said that the EPs were almost too soft to bomb cliffs on. The hellbents are just sick, and have better graphics. Since graphics are the only reason to make a decision on buying a ski, I am going to go with them.