New here but have been following this thread for a while. I also have the DAC2 and tried the JR with XP however, using KS and have been thinking to buy the full license. It is very musical, relaxed and very resolving I may add.
My setup is:
XP with W4S Asynch drivers and JR(KS) or XXHighEnd(KS) (testing both currently)
USB (WW Starlight6 usb)
DAC2 directly driving the W4S ST500 via balanced ic's.
I used the JR for a few days and the results are very good. Recently I gave a shot to the XXHighEnd which brought things to another level. Specially with female vocals the results are astonishing and there is now lots of air around the singers and instruments. On a side note the nice thing with JR is that you can have it read directly from a CD and output via usb to DAC2 (thus you may not need to turn the CD to FLAC). I also tried the up-sampling (for CD playback) used in JR and it gave me the impression that restricts the air around recordings. The sound does become slightly more analytical but I think there is a slight compression as well. It is best to leave DAC2 do its job alone. JR is very good all around and I may still get it, but memory playing with XXHighEnd seriously got my attention.
Kudos to W4S for such a wonderful DAC (and power amp)!
Cheers and happy listening!