cy
The new Surefire L1 is shorter than the older generations. The position of the electronic board in the body being perpendicular versus parallel contributed most to the decrease in length.
I use my L1 as a work light (ala 5.11 flashlight/mag pocket for their tactical pants) and it has been dropped, thrown back and forth, and used heavily; still works great!
One bad thing about the light is probably the clip. Its short and stubby, not an issue for me because it snapped off and I filed that area down so it is now flush.