There's a lot of cynicism on this board but from my personal experience it worked perfectly with a high degree of fidelity. And my library is varied all the way from ripped mainstream CDs to classical music compilations and even some rare dance studio mixes. I checked some 300 tracks replaced to higher bitrate tracks from Apple's servers and up to now, I have 100% fidelity. Maybe I got lucky. Maybe people are reciting their beta version experience of 6 months ago. I wish people would disclose their particulars so people reading these boards could make informed decisions. As of Dec 15th, the service appears perfect for MY needs.
Absolutely agree, signed up for it on Thursday night and it's working perfectly for me. Current upgrading 9000 out of 11500 songs to higher bitrate...