I personally think they are the bain of society. A good friend of mine has one. It has two reticles to move, not just one. So to site it in, you move the first reticle and then have to line up the second with the first. He brought it to Africa with us in 2004, and made a few impressive shots with it, BUT he had trouble holding zero a few times. We were sitting at the range (in South Africa) reading the book and trying to get it back on target. It was a PITA. We got it figured out but WAY to much work. Recently he brought it down to Texas for some hog hunting, it again lost zero, I don't know why? (He sent it back after the SA trip) But the one I have been close to seems way to complicated.
From what I have read/heard, they are impressive and can do some good LR stuff for hunting. But I wouldn't own one and would go with something such as a Varmint Reticle by Leupold.