I have the newer XL50. It a more simplified version of the XL100. As others have said here about the XL100, it's way too complicated for a flashlight. Just too many feature that few people need in a light.
I like the newer XL50, simple high, low, and strobe. That's it. Throws a pretty nice bright wide beam too. The focus feature on this light is useless and unessesary. Fully tightened down it's already focused about as good as it can get, no need to fiddle with it.
Drawback is that the electronic tail switch allows a slight trickle drain when batteries are stored in it. I've heard at the rate it drains, a fully charged new set of batteries stored in the light would be fully drained after 3 years. Not bad, but as long as you use it regularly I suppose there's nothing to worry about. Other drawback is that it's machined aluminum body is not as thick walled and doesn't seem as sturdy as the original Maglite products. Seems thinner, but it's still plenty strong and doesn't feel weak. In fact it's thinner walled design also lessens the weight. This thing weighs about what a 2AA mini-maglite weights.
The light will touch an object out to approx 134 meters under dark moonless night conditions, but just enough to know something is there. At 134 meters it's pretty faint. In reality it's beam usefulness is only to about 90 to 100 meters. Overall I like it, and at $29 it's a lot of light for the money. Just a simpe no-frills, fully functional light.