I just upgraded. I noticed two things right away:
- black seems to be blacker, nice

- I have the small top margin
The small top margin thing appears in my side-loaded epub, the one I'm reading now. I haven't looked at any other books and I haven't tested anything else. I'm contemplating going back to .16 because the margin really annoys me. Not just because it's out of balance with the bottom and it's troublesome aesthetically, but also because the the margin is so small that the top line of text is now hidden in the shadow from the KT's top part of the plastic casing.
Thanks for the update though.