I neglected to post my impressions of the soundtrack after I received it. I do not think I have the musical experience to write a full review though...
Anyway, if you are a fan of the RE4, this is the definitive release of the music. I am happy to report that Separate Ways and the Mercenaries are both fully represented on this album. Sweet!
Oh, also Capcom decided to classify the discs based on the music. Disc 1 is the Darkness Side, which contains up to the battle at the end of Disc 1 on Gamecube (see, no spoilers!) With the exception of Del Lago, most of the tracks are very ambient.
Disc 2 is called the Aggressive Side and the music is just that, with one or two exceptions.
The included artbook is a nice bonus, with lots of ingame pictures. The RE4 T-Shirt I received was a nice bonus as well.
If I had a complaint, it would be that "Back Up" on Disc 2 is too short, looping only twice. This is the music that plays when Mike and the helicopter come to help you. It is a very intense action track that reminds me of Rambo. Oh well, it is still a very solid 2 disc set.