My experience is similar to Jprice. To me 306 is more weighty with more macrodynamics and bass. It does not seem to have as much air or detail as the ayre. The 306 have a higher quality transport. Both are excellent but very different. I suspect personal taste would be the dominant factor here.
I think Ayre is one of best 2nd tier cdp.
I think Ayre is one of best 2nd tier cdp.