IMHO the extra size of the 9P is worth it.
Only place the 9P is a bit to big is when out at clubs on the weekends, but it still rides in my jacket pocket. The E2D is clipped IWB.
Once you see the ligth (the 100 lumens that is), you won't go back.
You can get 100 with a P61 bulb in the 6P, but then you use 6 batteries per hour. With the 9P you use 3 batteries for the same time.
I have chosen to go to a P91 bulb, 200 lumens. I'm not going back now. :hypnotize