GOOD:
The good news is that it is very nicely multi-threaded. Check out this 300kb screen shot of it in action on my Dual Xeon system (Hyperthreading set to ON). The 4 logical CPUs were averaging 70-75%. The 20 minute project rendered in 14 minutes (NTSC DV avi to NTSC MPEG-2 Video stream for DVD architect).

BAD:
It appears that you need to render all tracks to an NTSC DV track to get good results. This 8 MB project shows what I mean. The project is a high-res still image with a Ken Burns effect. If you RAM preview the source, it looks great. But if you look at the MPG-2 I rendered on the track above, you see all kinds of sparkles. What the heck is that? Why does that occur? The only workaround is to first render to NTSC DV and then render that to MPG-2.