Readmill is shutting down. Alternatives?

It was one of my favorite apps, and they're not going to push any updates to it. So is it alright If I stick to it after they're dead? Or is there any better alternative?

I can do without the social features it had, and I have already made backups of my book. What all readers do you guys use? And what are you going to use next, if you're a Readmill user?