But you do have the worry of DRM. It might be better but it's not perfect.
This is my problem and it hit home recently when I upgraded my smartphone and discovered there's no Kindle ap for my new model phone and I couldn't read the rest of the book I'd bought on Amazon with any of the available aps. I enjoy the ability to stop reading on the Kindle, PC, Laptop, or smartphone and being able to pick up where I left off on the other devices. And what happens if the vendor where you bought your DRM'ed e-book goes under or is bought out? I think of buying e-books as being more like renting movies.