I've never rode on them, but I've seen Dirt Trax speak well of those shocks. Saying they are the best shocks on the market. Keep in mind they are pricey. Stage 5 Elka's run about 2 thousand dollars if I'm not mistaken.
I once rode around with a guy who had a highlifter rzr on 32 inch Mudder inlaws. I believe it has Fox 2.0 shocks, someone correct me if I'm wrong. I gotta say that thing was like riding on pillows. So if Elka's are better, I can only imagine how amazing that ride would.