I love mine. Aside from being a gorgeous
device, it's rock solid. I've been using mine constantly for over a month and have not had a single misfire. It's super easy to clean and maintain too.
I almost didn't buy the V3 because I wasn't sure about the concept of a bottom-buttoned
device. But once I used it, I realized how natural it feels to activate a
device that way. I also love the fact that the button locks. So I don't have to worry about it at all when I put it in my pocket.
I bought the heavy spring and recommend that option. Plus, for only five dollars more, you'll have both options available. The V3 comes with the light spring by default. But I changed mine out before first use, so I don't have any first-hand experience with the light spring. A comparison of the springs:
Heavy: Takes more force to activate, and that concerned me a bit when I ordered it. But I find it really easy to activate it with my pinky. The biggest advantage, though, is you can stand the V3 up while unlocked without it firing.
Light: Is reportedly
super-easy to activate. I've heard it's almost too easy, and you can't stand the unlocked device up. (Although many have reportedly stretched their springs out to allow for this.) Others have also reported that there is a slight battery rattle with the light spring. (There is no rattle at all with the heavy spring.)
Another big plus: The V3 takes either two RCR123 batteries for 6v or one protected AW 17670 for 3.7v. All you need to do to change voltage is swap the batteries.
My only regret: Not getting the Media Blasted finish. After seeing that finish in several reviews and in photos, I really wish I'd chosen that option. Oh well...