Has anyone used this service, and why should someone ditch their current provider to use it? All I've seen is the founder kicking off about Apple murdering kittens, which put me off looking any further. I've got my own domain hosted on google apps, and it just works. Rarely get spam, I'm used to the UI, I don't want to change my email address because I don't need to. Having said the above, I guess I am not the target…
The only features that look unique (I'm really only comparing Gmail vs Hey) is the Focus and Reply, the File navigator and the Feed. The rest are all easily done with filters/labels or already exist in Gmail. The others could be easily replicated by Gmail developers as well. At this point I wouldn't be willing to pay $99/yr for Hey.