I have been a big fan of the D25a for years. It's very slim and compact in my pocket. I have several of them, mostly the titanium versions that have come out every other year or so. I just upgraded to the D3a which is the most recent titanium version. It puts out nearly 400 lumens on a single AA! And over 700 lumens on a 14500. I like that I have a good bright flashlight that puts out enough light on a single AA to facilitate most situations. I rarely find I need more. The past versions needed the 14500 to give me enough light for most situations, now I can just use an Eneloop, and don't feel any loss of performance if I need to swap out a regular alkaline in a pinch.