The benefit of having audiobooks in Google Play is you can listen to them via your Google Home speaker without having to connect another device via Bluetooth.

You can also listen to them through Chromecast and on iOS with the Google Play Books app. You can listen to you your books directly from a web browser, or devices with Google Assistant like your phone or tablet, Google Home, even Android Wear with connected Bluetooth headphones. Pull down the notification shade on your phone to control the book playback. Tap the button to purchase the book and it will be added to your Audiobook Library and you can start listening right away. You can search by author or title, browse categories, and listen to samples before buying a book.

Then you can browse through the list of available audiobooks like you would from any online store. Head to the Books section of the play store and if you try it before March, you should see a banner like the one below offering 50% off your first audiobook purchase.

Google play audiobook