The light I use most often is the Countycomm Maratac AAA on my key ring. I've used this light almost daily for the past year, and have only replaced the battery once using standard Duracell AAA batteries. Having grown up in the era when the Mini-Mag was state of the art, it still amazes me how much light this tiny, lightweight flashlight puts out.

I also have a bunch of other LED flashlights from Fenix, most of which which I like, some not so much, plus the usual assortment of Photon's and similar, and a Pico.

But I like the Maratac AAA so much I bought several more and sprinkled them around my various kits.