Fireclaw has been very unlucky with ZLs.. I'm simply shocked, how unlucky can a man be to have so many defective ZLs? But for the record I believe his side of the story 100%.
I wouldn't trust a Nitecore with my life since I had my first "good" light which was the P12 fail almost right after a single drop to the ground, waist height, yet most of CPFers say NC lights are super reliable, some of them have over a dozen of NC lights and none has ever malfunctioned. I respect that, but based on my side of the story I just wouldn't trust a Nitecore anymore. On the other hand, I dropped my SC62w on solid concrete over a year ago, chest height (I was throwing and catching and I screwed up). The drop didn't even chew through the anodizing, and the light is still going strong which make me respect ZL's dependability even more. I developed a weird habit after I got my H53Fc which is taking it to the shower to see if it can handle some water. 4 months and still kicking like a champ.
That said, a ZL light is more expensive than most mass produced substitutes on the market which do scare people away. However, I quote CelticCross74: "...the sheer scale of value you get with the new SC600 MkIII in any variant is unmatched" and I believe this statement applies to any ZL lights. I have three of them and I plan to get more, if one is not planning to step into HDS/Elzetta/Malkoff territory for that bomb proof build quality, a ZL light is what I consider an end game EDC light. Look at ven, he has dozens of high end lights, he got one ZL, was instantly hooked and now he has more than I do.