Hoya, I have a 6P, G2, and E2O with MN03 high-output lamp (as opposed to the medium-output MN02 the Outdoorsman comes with; I needed the long clip).
The E2-series lights are a true EDC package; I carry mine every day, and I wear dress slacks and shirt to work. IOW, you don't have to dress "tactically" to carry it comfortably. It is considerably smaller and lighter than the 6P, and considerably smaller and about the same weight as a G2. IOW, much easier to pack around.
It has a bit less light output than the larger lights with their P60 lamps. But if it means the difference between having a slightly lees powerful light, or none at all, which would you choose?
I've had that 6P since 1990, but have never carried it daily except on a uniform duty belt. Its just too big and heavy for EDC in "normal" clothes, IMO. The G2 improves that, bit is still too large for most casual/dress pants pockets.
The E2 series is a revelation, as far as I'm concerned.