Audo Note CD 3.1

Hello:

Does anyone have opinion on Audio Note 3.1 CD player ?
How does it compare to
Audio Note CD 3, or their toseparates T /DAC3.1
Accuphase 55V, 67 or 75V
Resolutuin Audio Opus 21
Gamut CD-1
Are differences between these units worthy of differences in prices ?