The guys in the military seem to prefer the Aimpoint due to ruggedness and battery life (vs Eotech for example) and I have not seen much praise of the reflex. There is also the Trijicon RMR which is smaller and available with long battery life or fiber optics and no batteries.

Just passing this along as I have some Trijicon optics but they are just scopes.

RMR info here:

http://www.trijicon.com/user/parts/parts_new.cfm?categoryID=13