Jumping ahead to late December 2021, I can say from personal experience that the Pro-Ject CD Box RS2 T is STUNNINGLY better-sounding than the Jay's Audio CD2-MK3 transport, even when the Jay's is linked to my Holo Audio MAY KTE DAC via its i2s HDMI-style interface!
My Pro-Ject CD Box is connected to my Holo Audio MAY DAC by the best-available method, AES/EBU, using a Shunyata Research Alpha Digital v2 AES/EBU 2-meter cable, and "this combo beats the pants off" the Jay's.
What really gets to me is that before I ordered my Jay's Audio MK3 CD transport, I did a LOT of searching-around on the Internet for the best value-for-money CD Transport out there, and the Jay's Audio unit was the only one I could find.
Later, quite by accident, I chanced across a reference on Audiogon.com to the Pro-Ject CD Box. Before, I had NO idea it existed! As it happens, during my search for reviews of the CD Box, I found one for sale here in Chicago, at Music Direct, so I grabbed it out of sheer curiosity, knowing i could return it if I didn't like it.
I've had the Pro-Ject CD Box unit for just day, and I'm already literally overwhelmed by the detail I am hearing from my large CD collection, detail no other player or transport I have ever owned has been able to retrieve.
Now I'm in the regrettable position of knowing that I'm going to have to sell my Jay's Audio MK3 transport. It is a beautifully-made piece of audio gear - so it's a downright SHAME that Jay's didn't opt to use the new cutting-edge Philips-based-design CD mechanism used in the Pro-Ject unit. The build-quality of the Jay's Audio CD transport is exemplary - so it's unfortunate indeed that they based it on an obsolete, no-longer-manufactured CD drive and optical mechanism. Seems Jay's Audio scarfed up all the world's remaining stock of this obsolete drive, so they're good to go for a while to come, but the SONIC RESULTS the Jay's Audio MK3 produces come in a distant second to the CD Box RS2 T's.
Hard to believe a humble CD transport mechanism can make THAT much of a sonic difference, but the proof of that is right here in front of us.