I have been using my Stinger LED for a few months and I like it very much. It's serial number begins with a C, however, it is noticeably dimmer than my 120 lumen C4 Scorpion. Which by the way I use every day in the prison. Even so, my Stinger is my primary light when not at work. Streamlight, my Stinger and my Scorpion are just awesome. I can order parts when needed (and have done so) and they are bult very nicely. I tell this to anyone who seems interested including this forum but I don't see much talk about these lights, I don't understand why.
I think that perhaps the C4 designation does not necessarily mean 120 lumens. I'm thinking perhaps I should order the LED assembly. Nah, I'll wait and get the next model.