My problem with Inbox is that it doesn't let you easily delete emails. It's 2 or 3 actions to delete, which is unreasonable with high mail volume. The Google party line is that you should never have to delete, but I don't care to have old quora digests in my archive when I'm searching for actual relevant mail.
In addition, the snooze feature for Mailbox is extremely helpful.
In addition, the snooze feature for Mailbox is extremely helpful.