IMO the space between two manga pages in the new reader is way too small. I don't really have a grasp where the old page ends and the new page starts without paying extra attention to it. In the legacy version of the reader it is made pretty clear due to a wider margin being used between pages. Is there a way to change that in the new reader?
The scrolling feels really fast, which is an improvement to the old reader, but the main page seems pretty cluttered now, at least for my tastes, but I guess it just takes time to tweak some settings and getting accustomed to the new design. Great work and well done, overall.