I have had both, kind of. I own a set of Rockers now but, I have yet to take them out. I have used the IROK's before and had some mixed thoughts about them. They were a good tire in the rocks, great in the snow, and performed well enough in the mud that I had never been struck. The IROK's were not a bad tire but, I am expecting better things from the Rockers.
LT.