I ordered this box set and it should be here this week. I'm very excited, needless to say. It's too bad that there will not be a M3. From this set I have never seen 1, 5, 6, and 9. I have heard snippets on YouTube and they sound tremendously good to my ears.
I forgot to respond to you, Barry. I agree, these performances (and Abbado's Lucerne ones) should also be transferred to CD. I have the complete Lucerne Mahler cycle (with Chailly's Lucerne M8). Since Chailly 'finished' Abbado's Lucerne cycle, I have no problem substituting in Abbado's Lucerne M3 to 'finish' this Chailly Leipzig cycle when I watch it since he was Abbado's assistant, and Abbado's approach is pretty consistent with Chailly's approach in Leipzig: quicker (than Chailly's studio accounts at least), tight, incredibly played, and focused on clarity and structure. This is how I like my Mahler to sound, too. They both do away with the slower, Romanticized dramatic aspects in these cycles.
If Chailly ever did a M3 in Leipzig and this were all transferred to a CD cycle of some sort, we'd have a Mahler cycle for the ages.