To me, the dealbreaker in
Mantano Premium is its inability (so it seems!) to adjust
paragraph spacing. I just can't stand zero paragraph spacing in e-books, but Mantano Premium seems to be enforcing it.
This is no coincidence. Paragraph spacing is absolutely
the toughest formatting customisation issue for e-book software to handle. That is why low-quality e-readers -- and that includes Kindle and iBooks -- do not allow you to adjust paragraph spacing. Marvin 1.0 was missing that feature, too. Kris then went through the nightmare month of January 2013, putting in 20-hour workdays (or so it seemed), trying to get paragraph spacing right. And he did.
Also, as mentioned earlier, Mantano Premium seems to be conflating "publisher settings" with user-side preferences. I can see no button there for switching between the two views -- but there
is such a button in Marvin and Moon+ Pro. I like it how Moon+ Pro calls that button a "Preview" button -- that clearly suggests to users they should
not be using that view for
actually reading books in Moon+ Pro. This has led to some confusion in Marvin when folks activate "publisher settings" and then they complain they're unable to "customise" them. Well, they no longer would be
publisher settings once they're customised, right?