I don't get the hype. This is how my gmail already works. I use priority inbox. New senders get high priority until I mark them as low priority, and then they don't. Gmail already has a snooze button so I can reply later (and also I have a reply-later tag that's easy to do with keyboard shortcuts).
You can do this search in gmail to replicate their sorted inbox: [is:updates in:inbox -l:important]. I just have a bookmark for that.
Finding attachments is easy. You just do [has:attachment]. I don't want all the attachments without their emails. The email provides context. Also, I can usually find it faster because I usually know who sent it or at least some words that were in the email.
What am I missing about hey.com? Why do people love it so much?