Hi,
I wrote something similar at Creative Cow. I am posting it here as well.
I received a loaner card for a few days during Optibase's beta program.
I ran it in CBR mode (it supports VBR, but I didn't use it), I used PCM audio, and SDI output from my deck.
I had to create the playlist (I wish that it imported directly from Final Cut), and the card controlled the deck and created multiple segments for me.
I used PCM audio so that I could create both DTS and Dolby. I used DVD Studio Pro 3 to create the tracks.
I was able to lay out DVDs in about 2/3 the normal time. The card worked flawlessly. The video was better than compressor (no surprise there). I think that it was better than the SD-1000, but this is from memory.
Unfortunately, I had to give the card back. I heard that it was released. I asked for a price, and I was told that it was $7K. It seems reasonable since I was able to create 1-2 extra DVDs per day.
-George