Anything that gets you out of Apple's proprietary world is a good thing. And from a value standpoint, there is simply no comparison. The Nexus 7 Android tablet is superior to the mini-iPad in every way.
Example: We owned an iPad. It was so bloody expensive that we treated it like a raw egg. The fear of dropping or losing it permeated our every action, and we NEVER left it unattended in a coffee shop, due to fear of theft.
Between that, and the stifling Apple ecosystem, it drove us nuts. So I sold it on EBay.
The Nexus 7 has been everything the iPad was not. We have owned five of them between the three of us. Twice we have smashed them, due to carelessness, and although it's not "cheap", replacing my wife's $169 Nexus 7 sure beat replacing a $500+ iPad.
The fact that we have smashed two of them, BTW, is an indication of the level of use we get out of them. These things literally go everywhere with us, and I would bet we use them 2+ hours per day, every day. They ain't just for use in the plane.
I've used Garmin Pilot since it was introduced in 2012. In that brief period, it has evolved into a stable platform that does everything I could ever want from an aviation app. It is fast, displays traffic and weather flawlessly, and is rock-solid stable. We keep the Nexus 7 mounted in the back cockpit, and by toggling between Garmin Pilot and GRT's amazing EFIS app, we have every piece of flight info imaginable, instantly available.
I can't recommend the combo of Nexus 7, GDL-39, and Garmin Pilot more highly. It is simply a terrific combination, and gives RV-8 owners the best possible path to complete instrumentation in the back hole.