I've got a Pelican Pocket Sabre 2C, a Surefire 6P LED, a Surefire G2 LED, a Maglight 3D converted to LED, a Streamlight LED Tasklight, two pencil Streamlights, a hand-crank LED lamp, a Petzl E+Light, a C Crane CC Treklight (the original LED), a Princeton Tec headlamp, I used to have a Princeton Tec somethingorother, but it was broken, some other brand headlamp, a couple of Coast lights, and some other odd lamps here and there.
All of them are pretty darned good except the broken Princeton Tec, which was never impressive to begin with.
The Maglight, which burned batteries like crazy with a normal bulb, flickers a bit with the LED and makes noise. It came in a truck I bought. It is unreasonably large nowadays. I never liked Maglights.
I haven't used the Pelican yet, I only bought it because the my favorite gun store was going out of business, and I couldn't find anything else I liked.
The Surefires are nice, but even the LED models chew up batteries like there will be no tomorrow. They are best suited as weapons or weapon-lights, due to their high brightness. I haven't seen much point to step up from the plastic version. I own both, and both work fine. I wouldn't spend the extra money unless you just have to have aluminum for some reason or another. I bought the plastic version for use on my AR, as the aluminum model stuck out like a sore thumb, and I thought the plastic might absorb a bit more shock before transferring it to the weapon.
The Coast lamps are simply not up to the standard of the rest. They are fine for light use, however.
Everything else has worked well for a long time with no apparent drawbacks. I like flashlights a lot. I'm a huge fan of LEDs, and I'm always up to squeeze the wallet a bit and try out a new model that I think might be a step up from current technology.
The Streamlight is incredibly miserly with batteries for it's brightness.
The CC Treklight has worked flawlessly for over a decade, and I haven't been careful with it. It isn't as bright as the others, but it bright enough for most uses, and the batteries last so long that I replace them only as a preventative measure.
For blinding light, the Surefires, and the Streamlight are my choices. The Streamlight is more than sufficient for that task. For anything else, I'll use the C Crane most of the time, and the Streamlight, as both are bright enough, and both of them are easy on batteries.
Cheers,
Kennith