Great thing as a
concept. I believe this is the future of e-books: read any number of books for a fixed monthly price. $10 per month is fine.
They would need to expand their coverage, though, to make it
fully international. Every language should be represented as extensively in scope as English-language books.
And I agree we should be allowed to read books in any app we prefer, which for me would be Marvin as well. Or, they'd need to improve their app to Marvin's level, which seems unlikely, given that even a mega-corporation like Amazon is unable/unwilling to do so with Kindle.