Surefire's X200 are the proverbial cat's ass.
Now if they could hurry up with the DG switches for the thing....
Look out for NightOps/Insight's new pistol light, coming soon......
I am NOT impressed with Insight's M3 offerings, but the M3X seems to be a good compromise.
Sticks out a bit. They need to come up with a TRD device that fits in a holster.