Respectfully, I'd have to disagree with you on that. The app is very disappointing, IMHO. You can't attach a message to another message without downloading it as a PDF, and then uploading it as an attachment. You can't manage contacts in the app (need to use a separate app). Labels vs folders is poorly implemented (I want an auto-rule to move a certain type of message out of the main inbox to a designated subfolder, but can't, as I can only "LABEL" them, and they stay in the main inbox. I still have to manually move them.) Every time I use the app, I'm very frustrated with it.
On a side note, Spark and Outlook can also be set as the default mail app too. I'd choose one of these over Gmail all day.