I've had the "RD" unit for a week and have these observations:
1. The hiss in bypass mode is dramatically reduced.
2. The harshness has been reduced.
3. The treble has more resolution.
4. The midrange sounds cleaner.
5. The bass has more slam.
6. The background seems more quiet.
7. Overall the sound is more dynamic, articulate and natural.
The improvement is apparent on all material. Way to go Outlaws. This is a killer unit!

------------------
Helge Nylund