I am a designated marksman in the infantry, currently deployed to Iraq, and I've used an IOR M2 on my DMR in place of my issued ACOG, because I prefer a BDC cam rather than a BDC reticle.
I'll give a bulleted list of pros and cons, but feel free to post any additional questions
Pros:
- Extremely clear glasswork, as good as the Leupolds I've used, and better than my ACOG
- I have the CQB reticle, which I like a lot. It does good ranging, and the donut is good for close-in work. There are two other available reticles, the NATO MP9 and the Dragunov.
- Reticle illumination is clear and doesn't bloom. Illumination is not visible in daylight, but that works fine for me. The center donut does not illuminate, which works for me because in low light it would be a little much. With the front cap close I can use it with two eyes in low light or indoors as a BAC sight.
- Ruggedness. This thing is built like a tank.
- Bullet-drop compensating cam is extremely well calibrated for 62r, from 100m to 800m.
- Has held zero throughout my tour here (I use IOR quick-detach high rings)
- Great field of view
- 8mm exit pupil for great scope brightness
- eyecup is removable, so you can use it or not
- price: I think this is the best bang-for-your buck in a fixed mag scope you will find anywhere. You can find them for about $330-340.
Cons:
- It is a fairly long scope.
- Illumination not day-visible, if that matters to you.
- having trouble coming up with the third con.
As you can see, I really like this thing. I also have an IOR 3x25 and an IOR 1.1-4 CRT. I got many gifts from my shooting family when I came here!