I'm considering a 6P for general carry-around use. Looking for input on battery/bulb life and general reliability.
The SureFire is compact and very bright, and very well made. On the downside, with the standard bulb (p60), it goes through the relatively expensive batteries in only an hour, so it's expensive to run. Although there's a fair array of experiences, there are enough reports of SureFire lamp assemblies breaking after just a short drop that you have to consider them a little fragile -- and it's around $18 per pop every time you want to replace one.
I consider the Surefire an excellent tactical light, but less impressive as an everyday bright utility light.
So, if by "general carry-around use", you mean you'll be using it for your job, working around the house, etc., on a constant basis, I think it's a bad choice. If for some reason you need a really bright light for these jobs, there are much better choices. E.g., UKE 2L, less expensive to run, not quite as bright (though still very bright nonetheless) but runs a lot longer on the batteries, even more lightweight and compact. I'd also look at the 4-AA and even 2-AA models of UKE, Pelican, Princeton Tec.
On the other hand, for general carry around use, where you don't have some kind of constant utility in mind, the Surefire is great. My M-2 plays that role for me, sometimes swapping for a UKE 2L. I carry it around, nothing in particular in mind to use it for, and occasionally something pops up. At night, backup defense uses come to mind. But it's really used kind of rarely. When I know I have a specific job in mind, and I know I need a lot of light, I reach for my Maglite 2-AA with the bright Brinkmann bulb, or for brighter needs the UKE 2L.
Joe