Yesterday Sparrow, makers of the popular mail app for Mac, wasted no time wisecracking about Google's short-lived and poorly received release of the Gmail app for iOS by tweeting "In a few months, you'll get the Gmail experience you deserve on your iPhone. Sparrow to the rescue!"
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.