I received a Mac OS X 10.2 upgrade 3 CD set with an computer that was sent from Apple to our offices on Wednesday. Here are a couple of observations in my web development environment and personal use of the new 10.2.
Installation of 10.2 over a 10.1.5 system takes a long time in comparision to 10.1 installs. 40 - 60 minutes on the PowerMac G4 733 and PowerMac G4 466 units. Clean installations took less time, 20 - 30 minutes. However, since I had an upgrade CD set, I had to install my original 10.1 first and then 10.2.
The only big issue that came to light on my systems was the fact that every time I went to print to our LaserJet 4MV, the application would unexpectantly quit. So I downloaded and installed the HP LaserJet software for Mac OS X (revision date of 10-2001) and that made printing work again. (Go figure)
Other hardware that is working fine: Canon S600 printer, iMic, external FireWire hard drives. Software tested so far: Office X, Interarchy, MacroMedia products line, Watson (yes, Watson still contains more goodies than Sherlock 3). Quicken 2002 works fine too.
Speed: boot up is substantially faster, the Finder is more responsive, CD operations feel perkier (burning, ripping), multiple copies seem smoother in operation and a bit faster. Application launches are a bit faster, though not a lot faster in my experience.
My SuperDrive PowerMac G4 seems finicker about CD-R and CD-RW disks made by other machines. Even my commercial CD of WarCraft III was a bit reluctant to install (file copy error), until I took CD out and cleaned the surface which was not dirty.