I bought a Rev. C. model that had been dragged through Iraq and Afghanastan (sp?).
It looked rough, but worked fine for me.
I don't think you'll have any gripes about reliability or ruggedness.
They are comparable to an Aimpoint in price, ($350 - 500), and are arguably as rugged as the Aimpoint.
The Aimpoint wins in the battery department with 10,000 or more hours on a set of batteries, vs. the 1000 hours on the AA version of the Eotech.
The Eotech will shut off after 4 hours or 8 hours.
If you leave it on accidentally, this is an advantage.
If you're sighted on a bad guy, or game animal, it's a disadvantage.
Since the Eotech doesn't need a mount if putting on a flattop, or a Killflash device, I would consider it a slightly better value for the dollar.
But, if you were heading out, and didn't know how long it would be before you would be able to get more batteries, the Aimpoint would look good.
The Aimpoint and other sights have a cooler "look". I've seen the Eotech described as a Clown Shoe.
And, you have to decide which type of reticle you prefer.
With an Aimpoint, and the cheaper dot sights, all you get is a dot.
For most users, that's fine.
With the Eotech, you get a cool circle, with a tiny dot in the middle.
The Eotech is designed for Military/ Law Enforcement use, so it will probably stand up to anything you throw at it.
I just sold my older AA Eotech on the EE, because I (mistakenly) thought I could get the smaller N battery version for $250.
Now, I'm torn between getting another Eotech, or going with a Burris or Aimpoint.
I'm sure either one will rock!