I'll be honest. I bought a Preon 2 because of nutnfancy's glowing review of them. I was very pleased with mine at first but I've come to really think of them as almost being too fragile to carry with me every day. First problem, as many have already pointed out is that they just click on too easy. I've kept mine clipped to my pants pocket and if you just barely tap the top of it accidentally they will click on in your pocket and you wont notice until the light is very hot and you can feel the heat through your pants or until your battery is dead. I've killed dozens of AAA batteries this way. But beyond that... I've just had these weird connection issues where I click the button sometimes and it just doesn't turn on until I shake the thing or bump it against my hand or whatever. These lights were so popular that when I first started experiencing these types of problems I chalked it up to the fact that I must have gotten a bad one. Now I'm on my 2nd and I started experiencing the same issues not a month after I got it. Just last night I took my light and put 2 brand new batteries in it and then clicked the button and it didn't turn on. Then I took the batteries out and put different batteries in. Still no light. Not until after I took the top off and on and shook the thing a little bit did it finally turn on. I don't feel like I'm particularly tough on my stuff. I just keep it clipped to my pocket like I would anything else. But now I'm starting to feel like these lights are just a little flaky. Anyone else experience this?