Hello,
If you do search then you will see many inputs describing impressions of these amps and comparing them to other class D ampliifiers like Jeff Rowland 312 ($15k), Spectron monoblocks ($21k). It seems to me that general concensus was that all of these amplifiers are on about the similar level but no one did direct A/B comparison. I feel that if general perception is true - and I substcribe to it myself, again from my own RMAF 2008 experience then Bel Canto Ref 1000 MkII is clear winner in virtue of their price of $6,000 per pair allowing to invest the difference in other parts of the system.
I still did not have a chance to compare them with my Spectron monoblocks but one day I ....will
All The Best
Rafael