I run the 4-16 FFP on my 6.5x284, and will buy another for the next build for certain. The reticle pattern is easy to read at high magnification. Some folks take a look thru it and say the reticle is "too busy". Bullpucky. When working long shots, having that "busy" grid makes correcting your own errors much easier (ever mess up a wind call?) when shooting a braked rifle. I use the same rifle stalking in brush- and when you dial a FFP scope down to the lower magnification setting all that "clutter" is imperceptible, giving you a simple sight picture for snap shots when they present themselves. The side parallax adjustment works well if you know how to run it correctly. There is an excellent article on this website that explains in layman's terms all you need to know. The distance markings on that knob are only general guides- rest the gun on something solid, and turn the knob from infinity back down until there is no apparent movement of reticle against target, don't look at the knob itself until after the shot or you may start to doubt yourself. Great tool at a reasonable price, and if you ever need it, the warranty is bulletproof.