Critical issue: can't zoom in close enough to read. Annoying issues: cumbersome to navigate large texts (going backwards or forwards ~20 pages is an absolute slog. Maybe a double tap should flip 5 pages?) This is especially problematic for texts that refer back to themselves a lot (e.g., mathematics.) Cannot annotate while zoomed in, making it tedious. Graphical issues: the wrong animations are played when in an alternative coloring, causing a lot of flashing (i.e., they're always white.)