The Callas Remastered series is great value for money. The remasterings I've heard - which include this 1964 recording of Tosca as well as Norma and Carmen - are the finest available, even if the incredibly bright and transparent sound registers the occasional glitch or clipping (sometimes the editing seems a little overzealous). This Tosca is supremely entertaining, with spine-tingling performances, lush orchestral playing and a spacious stereo soundstage. Callas is Callas, a genius able to break your heart or make your spirits soar at will. There will never be another like her.
While others have been unimpressed with the packaging, I appreciate the obviously less elaborate cardboard slipcase and the paper sleeves. The booklet features only a brief overview in four languages and a couple of photos, which is a little cheap but nevertheless sufficient. The entire package occupies far less space than a single cd jewel case yet still possesses a printed spine for easy storage - if you collected all the releases in this series they would look great as a collection and still occupy practically no shelf space at all.
UPDATE: I've discovered these individual releases ARE from a box set! Maria Callas Remastered (The Complete Studio Recordings 1949-1969)
Looks like this will be my next big purchase!
Overall, a must buy for seasoned operaphiles and novices alike - great artistry, beautifully presented