Just received my Aviate Beta access code and launched it on my Samsung Galaxy S3. The first 5 minutes have been easy with a built in tour and a few recommendations from their team on how to use the new phone layout. So far, I think this is an amazing new app, but we will see over the next couple of days if it simplifies or impedes my use of the device. Check out more here: http://getaviate.com/
---- Update -----
Using Aviate on the OnePlus One, this application (IMO) is still the best launcher for Android.