I recently bought this thanks to John's recommendation.
In light of John's comments regarding the sound of the production, I have to admit I thought the sound quite impressive, full of depth but perhaps the strings were too distant during the louder climaxes. As John pointed out, the brass and percussion dominate the climaxes while the woodwinds get pushed into the background. At the same time, the sound picture is resonant and atmospheric, and the lower brass, bass drum and timpani are quite exciting to behold in all their glory (though the woodwinds are actually heard clearly during the second climax in the first movement). On my CD player (Sony SACD with Onkyo reciever with my bass setting at +4) and headphones (grado SR80's) the sound wasn't too bright, and the chords of brass and woodwind (with texture in the timbre) were "round" in sound so I could turn it up without fearing the sound would get too sharp...therefore I actually really enjoyed the sound picture overall, since the deep sound picture provides a dramatic "large" sound that fits well with the work.
The beautiful string playing, and straightforward tempos combined with plenty of passion makes this a powerful M9, so I understand why John still holds this M9 in high standing despite the sonics. I look forward to more listens!
--Todd