DON'T DO IT!!!! I was a fool and installed it and it was great for everything but FCS3. It brought it to a screeching halt. Granted, I'm on an older Quad Core 2.66 Ghz (10 gigs or RAM) but I had no problems whatsover prior to Snow Leopard. Maybe someone on the latest, greatest Mac might have a different experience but I can't imagine it would be a whole lot better.
After installing it, I was poking around a little bit, checking things out and then I returned to work. It opened fine, both FC and Motion, but when I opened a Motion project, I immediately noticed it was taking a very long time to load the media. I thought (or had hoped) it was just getting its bearings going after the install but I couldn't even get the playhead to budge. I switched over to FCP and it was the same thing. When I went back to Motion and tried to export a project that I had just completed, it was literally exporting it at 1 frame per 2 minutes. I thought it had locked up but when I came back to it again from FCP, it had moved to the next frame. After sitting there for 6 minutes, it exported 3 more frames. I stopped it and tried it a few more times with the same results. I tried rendering a 3 minute clip in FCP and it said something like 3 days. After an all-nighter, I called support and the gentlemen I spoke to said he hadn't had any other calls with this same problem but I reminded him it had only been released for two days at that point. When I spoke to support, it was the Sunday morning after I had already uninstalled it and re-installed regular ol' Leopard. What he thought might have been going on was that with FCS3 being a 32-bit program, Snow Leopard was trying to run it as a 64-bit program and suggested, if I decided to reinstall it, going to system preferences and clicking on FCP (I don't ever recall seeing that there, but ok) and telling it to run it as a 32-bit program. I'm on a PC now so I can check to see if it's actually there at the moment.
Anyway, that was my fun experience with Snow Leopard. Once I was back to Leopard, everything was normal and I was a happy camper again. I'd be interested to hear other people's experiences with upgrading to Snow Leopard. Especially with newer, better systems than mine. That's my two cents. Take it for whatever it's worth.
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