Even though I have most of the Chailly set in separate discs (2, 3, 5, 6, 8, 9, 10), I might actually buy the set just to get 1, 4 and 7. Chailly's M5 is my clear favorite of the seven or eight M5 recordings I own, and I've played it probably more frequently then any other CD I own over the last 2-3 years. His M3, played in either CD or 2-channel SACD, is, to my ears, one of the best-sounding orchestral recordings ever, with superb sonic presence, and is my favorite performance of the piece. Chailly's M6 is a great recording as well -- he takes the first movement slower than other conductors, and it conveys more gravity, more menace, than any other recording of M6 that I know.