As long as it works nicely with the PCI USB card I am going to buy, I will leave it as is. Also, I am using it solely for playing music (.mp3) and because the Pentium I is so slow, I use XMMS anyway (which is dead). So no real need to upgrade.
By the way, is there any lightweight alternative to XMMS still being maintained? No, Audacious is far to demanding. I know about a few music players running in terminal (don't remember their names) and even have them installed, but I am not seriously interested in those.
One of the few minor bugs I have in TC 3.5 is that I need to let the machine "finish thinking" for each operation when doing stuff with the CD drive. If I push it too hard the CD drive stops working
Really not a big issue though.