I've carried a 6P daily for a year now... It's a great light, rides easily in my back pocket, and is powerful enough for anything I've needed it for - volunteer fire/rescue/EMS, taking the dogs out at night, looking under the car, desk or whatever. I use it just about every day. I'm on about my 6th set of batteries, so I'm replacing them about every other month. As mentioned, surefire sells batteries for $15/dozen.

All said and done, I highly recommend the 6P for an EDC light.

~Wesley