I've got several SIIIs - six of the 6-24x50s, and a couple of the 8-32x56s. The 8-32s are reserved for BR varmint silhouette shooting, a couple of the 6-24s with dot reticles are for LR prone, while the rest of the 6-24s have the MOA reticle, and get used mostly in tactical & steel matches. There's also one 6-24 with a mildot reticle, but MOA knobs which I'll probably sell or trade eventually - it's just the 'odd man out' in the group, and I don't want to have to do the mental math to work with it, which is relatively easy to do with the MOA reticle. I've had no mechanical or optical problems with any of these SIIIs, and have even done side-by-side comparison with the 1st 8-32 & a NF BR 8-32. Optical quality of the SIII was at least equal to that of the NF, in either bright daylight, or dim late afternoon light.
I've never really learned to range with the mil system, even though I do have a scope with FFP mil dot reticle - but it's also got MOA knobs, so what's the point in having the FFP reticle? I'm not sure what this company was thinking when they designed the scope with this combination - maybe the designers were headed for making a fully-functional mildot scope when the marketing guys or bean-counters in accounting cut them off at the pass? Whatever - If you're not going to make the effort and take the time to become proficient at ranging with the mil system, why pay the premium to get a FFP scope? Far as I'm concerned, the FFP feature has its drawbacks - namely a reticle that's usually too fine when the scope's set at its bottom power to see or use mildot or other ranging features, nor is the reticle distinct enough to use in quick 'n dirty, close-range scenarios, where you'd be most likely to have the scope set at its lowest power.
OTOH - I recently shot a steel match where we had eight 8" diamond shaped targets at unknown distances, spread out across two ridges that ran from left to right in front of us. There were a number of cedars of various sizes spread all over these ridges, and you'd think they would've been useful as references to help you get back on a target with the riflescope once you'd ranged it and got back on the rifle - but with the morning sun shining into our faces, it was very difficult to do. I tried glassing the ridges with an excellent pair of 8-42 binocs, then switching to a 5x Terrapin LRF to range, then get back on the rifle and try to find the target again to shoot it. I only found & hit six of the eight targets before running out of the 20 min time limit. Frustrating to say the least, though I thought it was a well thought-out, realistic exercise.
A scope with a good ranging system and low enough bottom power to allow for decent field of view would've been the best way to deal with this problem IMHO, especially since each shooter was on his own, and not allowed the luxury of having a spotter doing the locating & ranging for him. If you're not going to get into these types of scenarios, then a scope with good optics, and accurate & repeatable adjustments is all you really need to worry about.