I just upgraded to the Axcel Armortech, and the guys that have the Spot Hogg were looking at it and wishing that it was their sight. It's the best of the best as far as I can see. It's a bit bright for the 3D shoots, but I just put a cover over the light collector part, and it's perfect for full sun. The best things that I can see about it it that there are no exposed fibers anywhere (they run inside a metal tube), and the fibers are cut off at their true diameter and not melted (mushroomed) out to a much larger size in order to hold the fiber in the pin. My eyes pick up that focused spot much better than the melted fiber sights, so I can aim more effectively with it.
I've heard and seen great things with the Spot Hogg line, but this is the sight to beat it, and at a slightly lower price, too.