I have a VariX-II that I have had for many years, had M1 turrets installed on it and it tracked flawlessly. It's my floater and loaner scope. I switch it all over the place, it's been on 20 plus rifles and AR's over the years and been with several other people on their rifles for their hunting season. The only reason I kept that scope for so long is that it tracked perfectly with the turret adjustments. Which is more than I can say for several of the Mk4's & LR's I have purchased and owned since. I did shake the adjustable adjective loose and had to send it back to Leupold to have it worked over but that was due to 100 or so 500gr .450 Ultra Magnum loads off the bench. Of course the service was free and it was back to me in 10 days.
I believe I only paid 275.00 shipped for that scope off the Long Range Hunting Forum "Classifieds".