So you haven't had any crashing problems or the like? Lucky you, many people are having major problems with this one. Personally, I'm going to hold fire until I hear that most problems have been patched out, even if that means waiting for the Gold Edition (inevitable expansion + fully patched base game).
Mate, if you like the TW games, look into this:
zavvi: Medieval II: Total War Gold PC
You might be able to find it cheaper. A while back, they were doing it for ?8.95, don't know why they've put it back up. Anyway, there are some really exciting mods coming out for it as well, including a Lord of the Rings one and a Roman one.
If you like TW you need to check out the Total War Centre.