If you like them, then that's what matters for you. I terms of glass quality, I have tested them and they are just not on par with similarly priced European scopes.
As far as tracking and focus, I'll give you an example. Today I had 2 Mark 4's at the range to sight in. The first one was all over the place for about 10 shots; up, down, left, right, shots were going 6 to 8" apart on a proven sub MOA rifle. I was about to pull the scope and try a different one when for whatever reason it just clicked into place and started shooting normal groups. No rhyme or reason. We'll see what happens the next time I take it out. The second Mark 4 maintains a consistent zero, but has a terribly out-of-whack parallax dial that completely blurs out the image until you hit the 300 yd setting, no matter how hard you try to focus it. For scopes that are billed as military and law enforcement optics, I think I'd trust the super cheap super sniper over these name brand turds.