Has anyone ran this thing yet? I haven't heard much on them and I love the Burris ff3s but I like the circle dot of the holosun. I have 2 holosun 508ts and I have one that won't hold zero. I've contacted holosun and it looks like it's going to be a hassle returning the sight and getting a replacement. So now I'm looking into the Burris ff4. Does it share the same footprint as the ff3 and has anyone been running one?