Well, they arrived. Performance "profile" (obviously more output, but same "beam" shape, etc.) is identical to the F04 on an X300. The beam profile is like an SST90 with an orange-peal reflector, except that the transition from the center of the "cloud of light" to the edge is very linear vs. what a reflector would produce. Output loss is probably the same @10% as the F04...hardly noticeable, if at all.
This would be EXCELLENT for clearing even larger rooms/buildings (note: NOT! 200 yard hall-ways, I mean 60x80' rooms.) It has a lot of lumens pumping out, even if they are diffused, that I predict (have not shone it at night outside) that would allow good, solid target ID's at 100 feet. Very easily, due to the large amount of brute light being produced.
I am impressed and pleased, and will provide beamshots of it outdoors tonight.
25 yards without diffuser
http://i41.tinypic.com/2nqabtk.jpg
25 yards with diffuser
http://i41.tinypic.com/2ustlcw.jpg
30 yards without diffuser
http://i39.tinypic.com/16atrpi.jpg
30 yards with diffuser
http://i40.tinypic.com/md1utu.jpg
35 yards without diffuser
http://i44.tinypic.com/2pzi2z8.jpg
35 yards with diffuser
http://i42.tinypic.com/mj20c6.jpg
40 yards without diffuser
http://i44.tinypic.com/10cvjfm.jpg
40 yards with diffuser
http://i44.tinypic.com/2q2o9sj.jpg
45 yards without diffuser
http://i39.tinypic.com/2j10b41.jpg
45 yards with diffuser
http://i43.tinypic.com/14vrxu9.jpg
50 yards without diffuser
http://i39.tinypic.com/2j10b41.jpg
50 yards with diffuser
http://i39.tinypic.com/2hz32ww.jpg
70 yards without diffuser
http://i42.tinypic.com/2s79xma.jpg
Camera was set to best mirror what I saw with my own eyes regarding tint and illumination. However, with my own eyes, the spill with both F04-A and sans F04-A was definitely more revealing than the camera could capture. The X300U did not give the sensation of "looking through a drinking straw" that the previous X300 did, in the least, even without the diffuser. I would go so far as to say that the diffuser's main use is heavy cover, or indoors.