My time spent with this recording was quite enjoyable. It's very natural sounding, and highly atmospheric; especially Brother John, this may be one of my favorite renditions of that movement on record. The flow, and ease of playing really give a relaxed feeling to the first 4 movements, remember Blumine is included, while the Sturmisch is filled with lots of energy. I am not a score junky, so all the little differences between this and the newer editions were lost on me. Nothing really slapped me in the face, though. Another listen may reveal more.
Roth's interpretation is nothing revelatory to my ears, it's just a fine recording of the Mahler first.