I can totally understand the appeal of OS 9. It is definitely faster in feel and general operability. I complained about OS X's GUI for a year straight, only to be bombarded on this forum for this or that reason. OS X has its frustrations, to be sure, however...
There is at least one area where OS 9 can not even touch OS X and that is fearless multitasking. Sure, OS 9 pretends to multitask and occasionally you can get away with it, but OS 9 cannot hold a candle to OS X for something like this, which I do consistantly and wouldn't even dream of doing in OS 9:
1. Capture DV footage, full tape, hour long, no skipped frames
2. Download a 20 MB file from the internet, decompress it
3. Work in Photoshop
4. Burn a DVD in Toast
5. Print several high quality, large file prints from InDesign
6. Render After Effects composites
All at the same time, no problem (DP 1 GHZ G4 1 GB RAM). That second processor surely helps, but so does OS X. Try that in OS 9. Go ahead. Try it.
What's scary is that on the DP G5, you can monitor the CPU usage running all that stuff and you will typically still have headroom where on the G4, you'd be maxed out quickly on the CPU. That means you can run tons of stuff on the G5 and not even detect a delay or hiccup amongst the apps (assuming enough RAM, etc.). That is impressive.
I switched to OS X back in the "Beta" days, because I knew it was the future and I knew someday its advantages would be worth it. I think we're just now on the cusp of that day with the G5s and Panther. I mean, Exposé alone is just about worth the switch. And can you say "Seven DV streams in FCP"?
It's funny, it's almost like we have a 3-way OS war now!
p.s. What is this "Quark" thing everyone speaks of? (joke: XPress is dead to me.)