I've found that a number of people - myself included - are initially very disappointed with their A2. You rip open the package, fire it up, and think "hey, I have better incan lights and better LEDs than this."
But the crazy thing is that you start reaching for the A2 more and more, and it starts to grow on you. The LEDs are designed to provide a useful flood, which is what I usually need on low. And the incan is there with a tight focus when I need to "reach out" and illuminate something farther away. And there's nothing like an incan for color rendition - LEDs just make everything look flat.
The switching is perfect - you have both types of light immediately available with the press of a button. Yes you could carry two lights, but why? With the A2 you have two different lights available at your fingertips. The A2's small, convenient, and bullet-proof. I find that it's simply the light that I reach for more than any other. It's got everything that I need for 95% of the times that I need a flashlight.
I almost returned my A2 a week after I bought it because I didn't see the need for it. Now I can't imagine ever giving it up. It's the light that I turn to before everything else, and the one light I'd take with me in an emergency.
So I guess my bottom line answer is that it's just useful - exactly like a good flashlight should be. It may take you a month to appreciate the A2's true utility, but I'm guessing that if you spend a few weeks with the A2, you'll be a convert.
- FITP