Hope I'm not to late!
I am currently in the middle east and several troops here have the EOTech. I did some research and finally settled on the Aimpoint CompM3 (that I purchased incidentally to use with my M1A Scout Squad and my M177 Carbine back home). The first and foremost thing I didn't like about the EO is that it sits so low on the rail of the M4. With the light recoil of the M4 in CQB shooting, it is easy and usefull to bring the weapon and sight up to your head, not bend your head down to the weapon...personally It was impossible for me to look through the EO without bending my head down. I also think the EO is way to busy...the circle around the dot just detracts from the target as far as I am concerned. I may be mistaken...but it seems to me the EO was water submersible to 30 Ft (please correct me if I am wrong), as apposed to the Aimpoints 135 Ft. I was recently looking to confirm that, but all the documentation I have read on the internet lately only states that the EO is water submersible...no depth that I could locate...where the Aimpoint clearly points out 135 Ft...not that I plan on diving with a CCO, but it seems that the Aimpoint should stand up to wet weather better then the EO (provide I am completely accurate). Finally, and this is purely tertiary to the performance of the device, is how it looks. The EO looks like something out of Battlefield: 2142. I liken mounting an EO to an M4 to putting asparagus on ice cream. While Ice Cream and Asparagus may look good separately, they just don't look appealing together. True, if the device saves my life, then I certainly won't care..but at this point I can look at my M4 with the Aimpoint and think, "That's Bad A#$!", while when I look at the EOTech I think, "Ugh!".
There is one other thing to consider: When a military Aimpoint is rendered un-serviceable, the device is turned in to the supply NCO or armorer and is destroyed...the army (at least) doesn't have them repaired. A GOOD supply NCO will STRIP the mounts, lens covers, honeycombs (anti-glare devices) and keep them for spare parts...unaccountable...you may be able to acquire some of these parts for use as your own spares or save you having to purchase a mount. Something to think about!