I listened to my system yesterday for about 5 hours with the uptone audio usb regen. Yes I definitely hear subtle improvements with it in the chain. I experimented with the hard adapter and the supplied USB cable. After about a couple of hours of critical listening, I preferred the supplied short usb cable over the adapter, contrary to what a lot of users feel and even what uptone recommends. Actually for me from a convenience point of view the usb cable works better. I will experiment with other usb cables down the road.
Cheers,
Sid