from what i've read, the L2 can not take Pilas cause the diameter of the L2 only fits the cr123 batteries really really snuggly were as the Pilas are just alittle bit too fat. i at least know for sure that the 168a will not fit cause i have one.
basicly the only con that i found about the L2 is lack of rechargeable support. but i love the L2 regardless ^_^
Actually, I was theorizing about whether you could run the L2 on JSB's R123s. Put one R123 in, and the Surefire Z20 battery spacer, and you'd have a rechargeable light, although it may not run for that long (half an hour, thereabouts).