One criticism though, the swiping is incredibly annoying right now. You have to swipe an almost painful amount to archive emails without a click, it should require less than half the swipe-distance of what it does now. Look at how little swiping Chrome needs to go back to the previous page, and emulate that.
Yeah, I've heard this a few times now. This is the standard AppKit NSTableView swipe action, but I agree it's not tuned very well – I'll look into improving this this.
One tip: by default, the Delete key is mapped to Archive (though you can change that in Preferences to be Trash if you prefer that). A little faster than swiping.
One criticism though, the swiping is incredibly annoying right now. You have to swipe an almost painful amount to archive emails without a click, it should require less than half the swipe-distance of what it does now. Look at how little swiping Chrome needs to go back to the previous page, and emulate that.