Those are some very well-done demos, thank you for your work.
Maybe my ears aren't well trained, but I didn't hear a glaring example of a hard left-right pan, except when hitting the instant-reverse-direction button to control the character (which, to me, makes sense that it wouldn't smoothly pan around, function of the game not the DSP suite).
THX sounded like 3D surround for me, one example of a highlight was @ 0:38-0:40 with the bullets pinging off the air conditioning tower at the 11 o'clock position. It did sound better when played through 720p playback quality.
If my experience with THX compared to your THX YouTube demo is any indication, I would also be happy with SBX. Positioning of the helicopter was obvious though out essentially the entire video, the surround effect was very pronounced and I liked it. The police pistol bullets hitting the blue stairs was particularly a cool example of positioning (and EAX?), although at 1:42 caused some distortion where Faith got hit by a bullet (with my M-100 plugged straight into my iPad).
CMSS-3D sounded good as well, though not a big stand out from the other's. I laughed a little at the end of the video.
Edited by Evshrug - 7/18/13 at 12:00am