Good red-dot optics have come a long way in the last decade or two. They used to be fussy, fragile things that went on the fritz unexpectedly while eating batteries like popcorn. Now you can leave them on for years and they're practically tougher than the guns they're bolted to.
The problem is that the good ones are expensive. About the price of a decent AK expensive, or half the tariff of a good AR expensive.
Aimpoint's new-for-'11 PRO (Patrol Rifle Optic) is basically their older Comp M2 sight (adopted by the military as the M68 CCO) with new circuitry for the dot, giving a 30,000hr claimed battery life, and the whole package, mount and all, looks like it'll have a street price a lot closer to four bills than five, which is a relative bargain in this market segment.
I really like my Comp ML2, but that 30,000 hours of battery life sure does look cool. That's... hang on, let me pull off my socks... like more than three years. You could just leave it on and change the sight batteries when you change your smoke alarm batteries.