Blue Line, billed as "Canada's Law Enforcement Magazine", has an interesting article in their December 2010 issue on Aimpoint and EOTech electronic weapon sights (EWS). In it, they pit 3 sights against each other in torture tests: The Aimpoint Micro T-1
The Aimpoint CompM4S
The EOTech 552 Holosight
The end result is: They all rock. But for a better explanation, and to see the torture tests they put them through to prove it, read the article posted here.