I received my copy a couple weeks ago. I found it mind blowing for two reasons;
1. It sounds really good. I agree with your assessment that Cellar Door is a 10 and Live at Massey Hall is an 11. Massey Hall does sound just a bit better; crazy good! Both have the, you-are-there, sound that seems to capture everything of import.
2. I can not imagine playing solo like this. It has to be very intense to be the only person on the stage. This may help to explain why the music is so darned good. I must confess I did not realize that Live at Massey Hall was just Neil for several songs. Then it hit me; wow.
If you like Cellar Door you will like Massey Hall and vice versa.
I sure hope Neil keeps on digging in the vaults! If he keeps digging, I will keep buying!