I've been using an Eotech on a couple of rifles - a V22, and a Remy 597 in .22 WMR - for a few years now, and most recently have been using it to good effect on a Mossberg 12g. Mine has the 65 MoA ring with a central 1 MoA dot reticle. The ring works well for quick, instinctive targeting, while the dot is precise enough to put 5 rounds into 1.5" ' 100 yards. I've accounted quite a few rabbits with it on the V22, with head shots out to 60 yards, so provided you're eyesight's up to it it should do the business.
Eotech's customer service is good - last year they repaired mine FoC even though it was out of warranty (and, despite the fact that as a "military" NV-compatible model it required an end-user type certificate to ensure it got through the red tape as well as across the Atlantic and back), and it came back good as new, in fact, until I checked the serial I thought they had sent me a new one as there wasn't a mark on it.
The only drawback with the Eotech is that it's designed so that the reticle is at the right height to "co-witness" with the battle sights on an M4, which means that whilst its at just the right height for an AR, it can be too high with a conventional stock unless you fit a substantial comb-raiser.
There are a few nice add-ons for it from GG&G (
http://www.gggaz.com) too in the shape of a lever-locking QD base, an extended battery-cover locking lever, and a set of flip-up covers that fit inside the shroud.
Conversely, if you go for one of the mini red dots like the Burris or Aimpoint H1, you'll need a riser block to get a comfortable head position with the AR's in-line stock.
HTH