I love my surefires, they are great lights for EDC. Tough, durable, bright, ect. However, if you are looking for a light for your BOB or your pack for outdoors go with something that uses AA's. Now, if you are going to buy a Surefire personal light for EDC go with one of the LED models, that way there are no bulbs to burn out, and no need to carry spares. Then you only have to worry about feeding it batteries (which are expensive if you buy them in retail stores and sometimes hard to find in other countries or out-of-the-way places). LEDs also have better battery life. I recommend the L2, L4, and E1L. If you are dead set on an incandescant go with the A2, that way you atleast still have some light if the bulb burns out.

Also, check out the new Blackhawk Gladius light, many people that have one like that over similer surefires right now.