Ben Basing is right (and many thanks to him for his review, the reason I purchased this recording) - this presentation of Stimmung has, at its heart, a very human presence. It is perhaps worth considering this performance essentially humanist, as it seems to seek a unity of consensus in which the eruption of individual voices are not so much like the imaginary command lines of the eternally disembodied (which is what the early recording suggested) but more like singular affirmations of belonging.
So Stimmung, it transpires, has about it the capacity to radically evolve, which can hardly be a surprise given its compositional structure.
Still, it is quite a different version of Stimmung, it seems to have dramatically distanced itself from its origns, so I am not exactly astounded that elsewhere it has been greeted with some cynicism. But I would encourage anyone to give this recording a go - it really is very moving and although his hand is light, it is worth noting that Stockhausen himself contributed an ongoing critique to its evolution.