What's the general consensus on IOR optics? I've looked at ordering a couple over the years, but I've always read that warranties can be hit or miss. The one I'm looking at is a 4-14x50, with the side focus and illuminated MP-8 reticle. I've always heard that the glass on these scopes is superb, but how repeatable is the tracking? Plan is to use it on an 18" AR build for 6-800 yards, is there a better option right now at $650-700? Scope is likely around 5-6 yrs old....