"Used to use Mailbox but I'm trying out Boxer right now. Recently tried Dispatch but the lack of Push is a non starter, and they have no plans to add it. Boxer has some nice things like Todo lists and is able to open long email threads that Mailbox was struggling with. The integration with other apps and services is nice, a well. It still needs some more updating for iOS 7, though. The back swipe gesture is a bit off." - Brandon Titus