My wireless charging back cover arrived today. It actually makes the phone feel very natural when holding it. Not too bulky at all, almost like this is how the GS4 should have been. I always felt it was almost too thin, like I was going to break the thing. The added thickness is not that much at all. The phone overall is maybe a hair thicker than the iPhone 4S, and I think that is just from the chrome edge along the outside of the GS4. The new back loses the AT&T branding and the 'Galaxy S4' logo, replaced with the Samsung logo.
And another big plus for me, is that the added thickness provides much needed protection for the rear-facing camera. The only
reason I was running a case before was to protect the camera when setting the phone down. I hate using cases, so this setup is perfect for me. And! It works great with the Nexus Orb charger I already have. Bonus.