I had some reward points available, so I pulled the trigger on an nVidia Shield Tablet. I got the 32GB LTE version. Like JustinS said, I didn't need to, but since all I have to do is buy a $15 SIM card to make it work on my existing T-Mobile data plan, I figured, "What the heck, why not spend the extra $100 to get it without the AT&T contract."
Swap SIM, and I have a fully functional tablet that will replace my Nexus 7 (which I've been told by others on this forum, will NOT work well with the P3. The Nexus 7 II will work, but I have the original Nexus 7, which doesn't have the horsepower to decode the 720p video stream.
The Shield, by the way, uses a smokin' GPU-based processor. Check out this graphics performance benchmark. (Shield Tablet is 2nd best, behind only the Surface Pro 2, and almost 3X the iPad Mini Retina.)