When I commuted into and around NYC, reading on a larger-than-phone device was always totally unremarkable, so I'm confused. There's probably a cultural difference here that's interesting.
My phone is not a great reading device. Far too small. I do have ebooks on my smartphone in case I ever needed something to read, but the compactness of the phone made me never do so.
I wish the product page had more information though, unless I'm missing something. For example, how do I add books to my library?
You can drag'n'drop any ePub or PDF right into the browser (anywhere on readmill.com) and the app will automatically download it.
There's also the "Send to Readmill" button: https://readmill.com/support#send-to-readmill
That's cool, but iBooks works pretty well. This is prettier in a Metro-sort of way and less skeuomorphic, so there's that.
My biggest complaint about ebooks in the Apple ecosystem is that iTunes is a miserable way to manage them. And I want a single app for iPad and iPhone, plus a Mac version, which handle at least ePub PDF and mobi, and sync content and metadata. Simple, right?