So, I finally got my turn in line for Mailbox. Here's a short review of what I think: Features: The features within Mailbox should be implemented into iOS. They're just that good. I haven't seen these anywhere on any other app before. They're something to get used to but very user friendly. There's a tutorial describing them when you first open it. Usability: This app has a LONG ways to go. Unfortunately, it only works for gmail accounts at the moment. I have Yahoo and AOL accounts I can't link to it. Hopefully it gets updated with those providers soon. Was the wait worth it? Yes. I've been waiting a week to get my hands on this app. I love it and it'll definitely be replacing the standard Mail app integrated into iOS. Until they update it, though, it won't be of much use to me. The app uses a reservation list. There's currently a wait list of about 810,000. 20,000 slots get filled within 24 hours (roughly). Hope this helps.