I have 2 XTR III, they are great scopes, robust, tracking is excellent, and glass is great. The zero lock is easy to set, and turret have good clicks. The magnification ring is stiff and somewhat rough to the touch so I bought throw levers. I have no complaint so far.
I also have to XTR III's. Night and day better than my OG-XTR or my XTRII. Glass is a substantial upgrade. I wouldn't hesitate to by another.. .or two.