I was the same way when I bought it. I kept thinking, "Do I really need a $140 flashlight?" But, after carrying it for a while I have been amazed how usefull it is. I really think I use it more then my knife/multi-tool. The part that I can switch between LED and bright bulb is what I really like, sometimes you only need a little light and sometimes you want to make it look like daylight. Also, since LEDs don't burn out in anywhere near the amount of time bulbs do chances are I will never be stuck without some kind of light as long as I keep the batteries fresh.
If you really arn't sure still then check out the Surefire G2 (I think it is). It is only like $30 and is actually a little brighter then my A2 (but, isn't LED), the body is made from a composite plastic which makes it weigh less and makes it better in the cold then steel.