I was in attendance at the Troy Savings Bank Music Hall for this concert in 2001. We in the audience were all particularly impressed with the choir, and their excellence is really captured on this recording. They sing with the intensity that the music requires while showing enough restraint to blend perfectly as one unit. The tempo is also spot on (some other recordings really drag in Confutatis and Lacrimosa, for example).
Much has been written about Levin's completion and correction of Sussmayer's original edition. According to the CD's detailed program notes, Levin did not simply delete everything not thought to be written by Mozart. Instead, he used Sussmayer as a reference, while correcting voice-leading errors and adding a Mozartian sort of flare to the later movements. Many would consider it inappropriate to tinker with what is already one of the greatest works ever, and anyone accusing Levin of being pretentious might indeed be right. But to quote Duke Ellington "if it sounds good, it is good" and on this recording it sounds REALLY GOOD! Sanctus and Agnus Dei in particular really benefit from some of the modifications, and the Requiem as a whole sounds more cohesive than it did before. That is no small compliment.
Special attention should be paid to the "Amen fugue," a lost fragment discovered in 1962, which was supposedly meant to be a part of the original work. After some retouching by Levin, it is featured on this disc as Track 9, replacing the simple two-chord plagal amen of the Sussmayer version. The new fugue is really quite exciting and well put together, but the simple amen of the original edition generated a great emotional weight as well. Both interpretations are essential.
All the more reason to own multiple recordings, but just make sure that this is one of them!