Me. I'm using Panther.
Why?
1) I'm not sure if my applications I use will work on Tiger, such as: Adobe CS, Macromedia Studio MX 2004, Office 2004. But I'm sure they do work as I've read on the board that they do.
2) Printer drivers. Not sure if my Epson 2200 printer will be compatible with Tiger as of yet.
3) And while this isn't a "big deal", I'm not sure if my graphics card is compatible with Core Image. I have an ATI Radeon 9800 PRO Mac Special Edition, 256MB vRAM (in sig). I know the "ripple effect" shouldn't be a deciding factor in an OS, but still.....
Actually if anyone could clarify any of those reasons, that would be cool!
And I actually have never upgraded my OS. I still have OS X 10.3.4. I'm just nervous about something going wrong. I know there are relatively few cases where things go wrong, but still a lil worried