If you get the P2D (better than P1), and you get a L2D body (13 bucks) and the L1D body (12 bucks) and one tail cap of either LxD(7 bucks) then you have three interchangeable/multi-use lights!

You will have different size flashlights and strengths and your favorite batteries like your regular alkalines-1 or 2 cell AA, 1-2 CR123s, rechargables/NiMh, and Lithiums <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />

Your own "Lego" flashlight for a great deal. But for all three you need the P2D body and tail and the bodies (and one tail) of the others, just one head fits em all; but the complete P2D is the cheapest of these.

Like stated here they have a "Premium" version that's even brighter, the Rebel series and Q2-Q5 series which are more expensive and IMO not worth it, My LxD Cree's (originals) are way bright enough!