so the question should be, "what does a zml-viewer do that a browser won't do?"
and for the answer to that question, go visit that web-page i pointed you to earlier.
a web-browser will do maybe 1/4 of my requirements, half if it's lucky.
my zml-viewer will do 95% of them, 100% eventually...
so i think it's gonna be a better e-book viewer than a web-browser.
which ain't saying much, since a browser is such a lousy e-book app.
i think my viewer will be better than most other e-book viewer-apps,
but there's not much use saying that until you can try it out for youself.
and even then, what will matter to you is not _my_ opinion, but yours...