I just finished disc 4 this pm, it is a wonderful 4 disc boxset that showcases Miles in his prime. I have the original lps and this is one case IMHO where the cds are clearly better sounding. The sets are also complete with much more music than the lps and the first cd issues. Miles never stood still so don't expect "Kind of Blue" here. By the way, Mosaic Records are going to release a 6 lp box of this set this fall. The cds are priced right so here is a chance to hear jazz history by one of the best.