The ATI Theater 550 chip boasts MMC support per the Sept. 2004 press release and its add promotion showing a screen shot of the program's user interface. I bought a Sapphire Theatrix 550 with the chip given the advertisement of MMC support; I use the program on my AIW 9800 Pro, and it works well. The Sapphire model had a manual that said it was supported by MMC 9.04. Apparently 9.04 was not released. Instead, ATI released MMC 9.06, which does not support the 550. According to comments in this thread, The New ATI Theater 550, at about pages 27-30, there will be no MMC support--EVER!
Why is this important? Because the Cyberlink software offered instead:
1) Does not allow fine bitrate control;
2) Does not allow vbr/cbr control;
3) Does not allow the saving of mpegs to non-system drives;
4) Does not allow filter control;
5) Does not have an EPG (Not the version bundled with the Sapphire).
To address this "bait and switch", several of us have asked ATI what it will do to correct the problem. We received an encouraging: "We will check into it and get back to you", but the trail has gone cold.
I have a Hauppauge 150 with WinTV 2000 software, which is so much better than the 550/Cyberlink bundle. The 150 is even better with the free GBPVR. ATI's 550 does not work (at least not yet) with GBPVR. No program I have tried runs the 550 particularly well.
We all hope ATI comes to its senses, and provides the software support promised so long ago. In the interim, I recommend you stay clear of the 550. If you read a review from anyone who says the Cyberlink software is good, either they have not used any other software, or they work for Cyberlink or ATI. If full GBPVR support arrives, the card might be worth another look.
S.
PS GBPVR support is now available given ATI's efforts.