Prior to that I'd listened to Mackerras doing Mahler's sixth (not part of this set) - it was a freebie with BBC Music Magazine in the 90s - I have many of those discs. It's a live performance, and it's undone by horrible sound - dynamically all over the place so that one has to constantly adjust one's volume level, and it's mastered very low to start with. The performance is certainly interesting - not my fave but I heard things in the orchestration I've never heard before. It's the second recording in two days that puts the andante second - Mahler was on the fence about it - my feeling is the andante is so emotional and gorgeous that it hasn't been earned in second position. For me, it's much more affecting in third position, which is how most of the recordings have it.
