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i'm a bit torn between them, too. i've been using the aimpoint for a few years and the eotech 551 for about a year. here's my .02
dot - i prefer the eotech. i like the 1moa center dot for more precise shooting and the large circle for close-range shooting. surprisingly, the eotech dot seems clearer to me.
sight picture - the eotech is more 'open' with less in your field of view. another thing you can do with the aimpoint is when your battery starts running low and you lose dot intensity, you can flip the front scope cap closed and use it as an occluded eye gunsight (OEG). flipping the front cap closed increases the contrast to the background, almost doubling the perceived intensity.
switch - the eotech is easy to turn on, but it's slower to turn the intensity up or down. more difficult to turn the eotech off, especially with gloves (needs two fingers). however, it's got the auto shut-off that the aimpoint doesn't have. i've left the aimpoint on before, and it's also turned on accidentally (knob rubs the gun case and turns on) and i've drained the battery.
battery life - no contest here. i've got the 551 with the little N cells. aimpoint wins hands down, although the rev F eotech is supposed to have improved battery life.
mounting - i've never heard of a failure, but the eotech only uses one screw. i'd like to see two. the aimpoint allows more choices in mounting height. if you use an ARMS SIR (not bi-level), the eotech will not co-witness with your irons - it's too high. co-witnesses perfectly on a flat-top.
bottom line is that you can't go wrong with either and it boils down to personal preference and what of their different features are most important to you - they're both excellent sights.
cheers,
MM
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