I've got one (and I'm the person that added the link to the manual in the Wikipedia article), it works very well so far as I can tell, but I should point out that I'm not using hugely powerful speakers so there may be distortion I'm missing. I'm using it with a Sony amp, not Onkyo, using a component audio cable discussed in this thread:
Colour coding for Onkyo decoder component surround soundHope this helps.