TE 2004 doesn't have major differences with the former one from Goto.
Essentially, here the changes :
- the tournaments have been updated to the 2004 season
- a few bug fixes
- the game is 100% windows now (no more hidden DOS program), so it runs on WinXP
- if you have a version older than 1.24, then there's also some improvements on the AI, especially at net.
So if you don't have trouble with your current version, there's no big reason to buy this new one.
So keep your money to buy BALLOONrain ...
(which should be out very soon, now)