With lightning fast 4G connectivity and a quad core processor, the Lumia 635 moves at extreme speeds for a superior experience on a beautiful 4.5" screen. Showcasing all of the newest and best features in Windows Phone, enjoy countless smartphone experiences and real-time syncing, seamlessly across all screens. Introducing the best Windows Phone experience ever. Enjoy typing by swiping with Word Flow, the fastest keyboard around. See all of your chats, social updates and settings with just one swipe in the all-new Action Center. And make your start screen distinctly your own by adding a background photo to see your real-time Live Tiles come to life more than ever before.
They're very right about the uncompromised speed, I've been using it for quite a while now and it's been prefect so far.