I bought the Levine IPO M2 from Amazon; listened to it once, and then resold it on Amazon. I really didn't care for it. The recording is IMO poor, or I should say, poorly miked and/or mixed, as I kept hearing instruments in the forefront that should have blended in with the orchestra. While Christa Ludwig does well for a 60 year old, she sounds a little...old. In the finale, I felt the orchestra was definitely overshadowing the chorus. There may have been a good performance at that concert if you were in attendance @ the concert; but if so, I did not feel the recording captured it.
It's not the worst M2 I've heard. But I have many recordings of M2 that I like a lot and could not see myself revisiting this one. Levine completists may like it. Christa Ludwig fans may get a kick out of hearing her live in her 60's. I really like Levine's Mahler in the other symphonies he's done. I hope the Boston performance will one day see the light of day.