I used to run GRP Jollies and Atomics on my buggy and I loved them. I ran the medium compound. They felt hard to the touch, like they would be too hard, but on the track they were great. Hooked up well and lasted forever. That was on a hard packed, loose desert track. My other tire preference on that track was a medium-soft Panther KII, but they wouldn't last nearly as long (just to give you an idea of the track surface).