I know it isn't out yet, but I was lucky enough to try the beta. Believe me, you won't be disappointed. Many of the issues in the original have been eliminated and the game is lots of fun. 'Nuff said.
Costco used to have the original for only $7.89 as well as this one for about $45. Then they got rid of them in favor of them both being packaged together with the strat guides for each and for $45, an even greater value. Of course, they've had other such packages for $10-20 cheaper, too. Now they've got four Spec Ops games in one package for only $25.
Now Costco carries this expansion set for only $34.89, about $5 more than Wal-Mart had it for. I almost bought it there but wasn't sure if I wanted to try it. I think I'll get it now, plus the Baldur's Gate games. I'm finally getting a much better system, though not as fast or large harddrive-wise as I wanted but I got a Mob deal with it. You know, an offer I couldn't refuse. More on that later after I've tried it out.