I'm sure you're savvy enough to know this, but just a word of warning: Back up your files before you install TS2:U. I haven't personally had any trouble with mine, but over at thesims2 I've heard lots of reports of games installing badly, not installing at all, and lots of other problems generally leading to the whole game not working.

Like I said, I'm sure you know this already, but...yeah. I hate to see anyone lose games they've played for a while.