I absolutely LOVE my Pelican M6 LEDs. In fact, its my favorite flashlight, including my Arc 4s and Arc LSHs.
What makes the Pelican M6 LED special, IMO is the beam quality. All 5 of mine have absolutely perfect beam...NO lines, NO blotches, NO dark spots, NO rings etc. The only flashlights I've handled that are comparable to the Pelican M6 LED in terms of beam quality are Surefires....and the LED Surefires cost over twice as much. I'm guessing the textured reflector plus using an LED accounts for the great beams? The M6 LED has a nice hotspot with good sidespill, and flawless transition between the two. Furthermore, they are VERY white. 4 of my M6 LEDs are so white that they do not show any tint when comparing them to any other flashlight. My 5th M6 LED, my only silver one, it is possible to see a green tint, but only when comparing it to the other M6 LEDs.
Great beam, plus good size:brightness ratio (small enough to EDC using the holster), good quality (fit/finish), and excellent price (for what you are getting). IMO, they are a must buy for serious collectors. Two thumbs up from me.
On an unrelated note, I received my first incadescent Pelican M6 today, and its nice, but it doesn't have the perfect beam that the LED M6 models do. The incadescent Pelican M6 beam is much, much better than a Maglite, but there are slight irregularities (lines of darkness) in the beam (very slight, but still noticable).