Greetings,
FYI
I purchased both the 100 and the 250 at the expo, no problems with the 250 but the 100 was "flickering" on me. Made sure all the externals were tight, still flickered. Took the back cap off cause it appeared to be in the push button switch, sure enough it was. If your having the same problem, take the back cap off, there is a metal "ring" around the spring in the cap with 2 indents in it, take a pair of scissors, using the points of the scissor tighten that ring. Mine was loose, once tightened, it cured the problem.
Cheers,