I actually haven't found much that sounds good in Neo 6. PLIIx always seems to sound better IMO.

PLII seems to feed the surrounds in a more balanced way, while with Neo 6 I find the surrounds are in a feast or famine status.

M60s, VP150, QS8s(3), SVS PB12-isd, Denon 3805, Emotiva UPA-7