cia,
Listen to CajunBabe. "She knows from whence she is speaking!" I consider the L4 to be SureFire's greatest high output two battery achievement, with a "wall of light" output, and a manageable 5.1 inch length. To make it "the best in the north, south, east, and west", I highly recommend that you buy a McE2S tailcap switch from Don Mcleish, making your L4 a dual level output device.
In case you are not familiar with the function of these switches, a slight "sustained push" gets you the low level, a heavier "sustained push" gets you the high level, a "partial twist" of the tailcap gets you the sustained low level, and a "full twist" of the tailcap gets you the sustained high level. It is like having the dual output of the new 6 1/16 inch long L2 light, in a package roughly 1 inch shorter. You will find that as you use the L4, there will be times when the output will be too great, and you will want to tone it down a little. That is why Don made his switches. Another plus for the inclusion of a low level in a light, is the increased runtime, the lower running temperature, and the longer lifespan of the Luxeon light source.
Whether you get a switch or not, you will thoroughly enjoy your light.