I like Scrivener, despite the bloat. I'm just getting started as a writer, and I had to consciously restrict the number of features I am using for fear of getting bogged down. Little bit of a learning curve.
Its "Save As" feature is so robust, they don't even call it "Save As." It's called "Compile"; you compile the raw text -- which sounds a lot like what computer programmers do. Odd nomenclature notwithstanding, I like that there are, among the many formats you can compile to, a couple that are paperback formats. I have found them to be very useful in gauging my page count. If you are using MS Word, it is a crazy exercise in formatting to try to create a similar "published format." This is quick and easy.