I put my 2 week old E2e in the sink for about 5 minutes and it came out just fine. It was on the whole time too. Even pushed the momentary switch to see if water would leak in there when it was pressed. Tried it with the stock bezel and the KL1, both were OK. I took it apart and there wasn't a trace of moisture in the battery compartment, lamp assembly, or even on the threads.
I think they're pretty much waterproof, just wouldn't go diving with it. Surefire has different definitions for words like "Water proof" and "time", you know.
I would definately not worry about a mesely rainstorm.
-tibim