i've built months ago an amp around an Anaview AMS 1000 module... I would be very interested in how this compare to the hypex.
I've done some researches and found that is a module commercially used also in the Marten M-AMP and in Amphion pro amps, i really like the sound but i do not have the equipment to test it.
Comparing specs from datasheets i see an SNR of 93dB (measured at 1W) vs hypex' 124dB, and a noise of 60 vs 23uV, but the anaview is interesting because it costs way less than the NC400, around 360 dollars for the bigger version and 150$ for the smaller AMS0100.
The nc400 SNR is around 100dB at 1W, 124dB being at full power.
The anaview is a tad noisier indeed.
I have used these anaview modules, and compared them to the nc400.
IMHO their main problem is their input configuration: the end result is very depend on the output impedance characteristics of the source.
They need an additional buffer stage if the source is not well defined/controlled, and this adds $$ and noise.
The nc400 is a safer bet.