After enabling the authenticator, you no longer have to type your username and password, and then wait for a Steam Guard code to be sent. Valve has added some new features with the update, including the ability to log into your Steam account on other devices from your phone. So, there's clearly still room for improvement. It does still do some silly things, like exiting when you trigger the back button/gesture instead of going back one screen. The new app's performance (at least on Android) is smooth. Hopefully, this is a step toward making Steam's UI consistent across platforms.

The new app looks much better, with an interface in the same style as the recently updated library in the desktop client.

That should begin to change now that the new app is live after being tested as a beta release. As you might expect, user reviews in the App Store (Opens in a new window) and Play Store (Opens in a new window) are bad. Navigation was clunky, text didn't flow properly, and it was prone to crashing. It was probably worse than just using your browser, though. Prior to this redesign, the Steam Mobile app was essentially a wrapper for the mobile website. The new version, now live on both platforms, has a more functional design, additional login options, and the ability to remotely install games on your PC. That's changing at last with a complete revamp for the Steam Mobile app. Valve has offered mobile apps on Android and iOS since the early days of the smartphone era, and it's barely improved the apps since then.

Download steam mobile