ampfixer
I really like the latest Floyd re-prints. I have the Animals album and experience editions of DSOTHM and WYWH. I enjoy the deep cuts they include and the different unreleased mixes. Is it more compressed? I don't know, and if you listen to an ipod what's the difference. BEST sound ever comes from my tape machine into the 1959 Harmon Kardon tube amp. I was happy in the 70's.
I've also bought DSOTM a few weeks ago, the one with the live cd - and that live recording demonstrates just how much we've actually lost as technology got better, imho. It's so organic and vibrant.
On a side note, I've noticed that older albums which weren't so badly compressed don't seem to suffer the conversion to MP3 half as much. Frequency content obviously comes into play as well, I guess. As I replace iTunes versions of records with CD, I sometimes do a quick comparison.
With music from the 70s and 80s, the main difference often seems to be that the CD sounds a bit more 3D, with better stereo image. A bit more depth.
With albums released in the last 10-15 years the difference is far more obvious. In those case it's not a matter of the MP3 version not sounding quite as good as the CD - the iTunes version sounds bad altogether, with very obvious artifact - distorted guitars almost always sound as if they were running though a chorus or something.