Drawback for the A2 is it's fairly easy to burn out the main bulb. Also, not very good runtime on primary level. I have the L2 and think it's a better choice. The L1 isn't a bad choice either, low will give you long long runtime without blowing your night vision.

Seriously, look around candlepower forums (in the LED forum particularly) and hold on to your wallet. I think there are better choices out there (and I do have several Surefires). I have an HDS U60 that is my favorite. Has 3 main light levels: low low (for night adjusted eyes), primary, and burn your eyes out burst. It uses one CR-123 lithium battery (same batteries Surefire uses) and will run unbelievably long between changes. It is also much smaller than most of the Surefires and is built like a freaking tank. HDS has merged with Novatek and will have a new line of lights out in a month or so. (they have their own column under "manufactures" at candlepower.)

LEDs definitely rule, much more effecient than incandesant. Hold off for a month or two if possible, several manufactures are releasing new models (including Surefire) that use the new Cree LED emitters. More light and longer runtime out of the same battery.