The remastered CDs are quite good, though if anything called out for an SACD release, the Mahavishnu Orchestra would. Mobile Fidelity did Inner Mounting Flame a number of years ago, and it was better than the contemporary CD release, IIRC, but I don't know if it betters the modern remaster.

I have the recent 180g pressing of Inner Mounting Flame, and it's awfully good-- I don't think my vinyl setup is good enough for me to tell if it's definitively better than earlier pressings, but Mike Fremer had it on his Heavy Rotation list for a while, which is usually a sign of a good repressing. The same folks are reissuing Birds of Fire later this month.

I realize that McLaughlin and the surviving members of the rest of the band still aren't really speaking to each other, but I'd hoped that the release of the Trident Sessions album a few years back (excellent CD, btw) would open the floodgates for what is rumored to be a substantial amount of live material in the vaults.

Wolfgang's Vault has a number of live shows on it in FLAC, but I haven't had a chance to download any of them yet.