Mashable: When it comes to our inboxes, we all havebad little habits we just can't break. Whether it's deleting messages to achieve a zen inbox zero or having a ton of Gchat conversations open at the same time, there are things we just shouldn't do.
But you can still go back to the old layout if you prefer.
Overall, this looks like a decent UI update for people that use multiple Google services.
Spam runs rampant on Gmail, but you have options.