i dont own a surefire, and i know the batts are expensive, but i have played with them and used them inthe woods at night, and all i have to say is, they are worth the investment.
the batts are not cheap, but i have a buddy who has had one for three seasons and the batts have not startded to fade yet. and the beam that thing puts out is incredible!
its on my list, but right now, its tough to justify $160+ on a flashlight...... some day!!!