I also love the first upgrade! I found no errors in the manual. The improvements that I noticed were:
1. more bass definition/resolution and grip
2. a better composed midrange presentation. The fore, mid, and back-ground information is better balanced (vocals used to dominate a bit more).
3. a more holographic and 3D image, especially depth.
It’s really interesting that #2 and #3 can be true at the same time. Oh tubes…..