The 10X is the best rechargeable handheld light that I have ever owned. Its dual output levels make it a versatile as well as the brightest light around given its size and weight. Although I've only owned it since March, its nitrolon body and problem-free rechargeable B20 battery makes for a very durable light.
The only thing I noticed was during a recent run up a flight of stairs, the light kept activating intermittently... a minor issue that normally does not occur 99% of the time I carry this light (I prefer not to run stairs) Ah Hell, now that I think about it... the other thing that bothers me is that I can't find a decent holster for carrying the 10X... it's the equivalent of finding the Holy Grail.
Other than that - if you have the money to spend, it's a fantastic piece of work. I equate its full brightness to one of my 500,000 CP spotlights, but with only a third of the size.
-Jim