I've been using Splash Pro for quite a while now. Recently, I downloaded a trial copy of CyberLink PowerDVD 10. I observed the following differences between Motion2 and TrueTheater Motion:
1. Motion2 at its full setting introduces artifacts and judder to videos with embedded texts (e.g., copyright notices at the bottom of the video which do not change for the whole length of the video); and
2. Enabling Motion2, Detail Boost, Light Boost at the same time introduces unwanted noise to the video. Compared to TrueTheather set to Auto, the Splash Pro implementation definitely fell short of TrueTheater's picture quality (maybe screenshots are needed).
Maybe Splash Pro can learn something from Cyberlink's implementation of frame rate interpolation and resolution upscaling.
PS: And Splash Pro has no support for DVD yet, tsk tsk, too bad.