In January of last year (2015) I began the MK.II Tablet setup, using a bolt-in mount and a Samsung Galaxy Tab|Pro 10.1".
This tablet is MUCH more efficient than it's predecessor, and even though it's now nearly three generations old, it's still a beast for 4x4 ops. It is very very power efficient, and uses a dual-quad-core CPU setup that allows one quad core to utilize basic functions while the other performs the more advanced. Because of this, and newer specs, GPS is very accurate, refreshes fast, and renders quickly. All of this with music being streamed to the Head Unit via bluetooth. It still is a beast of a tablet. And, thanks to a few of Samsung's (now improved) software changes, you can even dual-screen apps to fit more info on at once!