My personal issue with the MK5 is that looking through it compared to the Razor and even more so, the XTR3, is that it's like looking through a tunnel. The Razor and Burris have much nicer edge to edge eyeboxes in them. The scope ring on the XTR3 is very thin, the Razor almost as much so, the MK5 not at all. I dont necessarily think this effects performance. I still think the MK5 has a decent eyebox, as I mentioned, its personal preference. It's not as visually appealing to me.