My 9P had an oval shaped beam for both the P90 and the P91. I think the best beam of any light I have is the E2 beam. My P60 lamps have a very tight center to them whici I don't find as useful. My P61 is has a relatively circular beam, but not as much as the E2. My P61 also has a dark circle within the bright center. It is rather odd. I keep thinking that it is some dirt or film on the bulb, but I have wiped it off several times nad the dark spots remains.
After testing most of my lights again each other after receiving my E2, I was again amazed at the brightness of the P61. I know it lasts for only 20 minutes and all, but man oh man is it bright. A hipo lamp for the E2 would just be amazing. Anything at or above 100 lumens would just be great form a light that small. Now that I have my E2 I feel like the G2 and Scorpion will see little use and the M2 not much more use, except for when I need the P61 lamp. The E2 really is a revolution, I hope they expand on it and start to offer more options on it in the future.