I also love mine and see no reason to switch it out for anything else. It just sounds right.
I had an April Music CDT100 that sounded great, but was weighted downwards. I also have a Musical Fidelity that sounds very very good, and doesn't do anything wrong, but it lacks the overall life and resolution of the Jay's Audio.
I'm looking around at dacs to see what would be a great paring for it.
I wish more dacs had the HDMI i2s output, as I have to be able to utilize the transport tot he fullest. I'm thinking about a Rockna Wavedream (expensive) and still haven't completely ruled out the Terminator (better price, but I don't love that it's voiced to be warm and lush, as opposed to simply being as transparent as possible).