I've been considering the hub for use with the Pioneer Appradio2 Android car stereo. I had viewed a couple YouTube videos and it seemed to have a little lag, but otherwise worked well. I do not own it yet.
If you purchase at Best Buy, I would recommend doing the price match for the identical item at the lower price from Amazon.
Amazon.com: Samsung WI-FI All-Share Cast Hub, Wireless HDMI Display Adapter (Black): Cell Phones & Accessories
I recall one of those YouTube vids mentioning an equivalent product, NetGear PTV3000 Push2TV. Here is a vid on that device:
Samsung Galaxy S4 wireless mirroring to TV with Netgear Push2TV PTV3000 - YouTube