I just wanted to let you know that I sideloaded the amazon appstore a few weeks ago and it is working great. Ive downloaded a dropbox, netflix, among other apps that work fine. I wanted to try with paid games but wasnt sure. A lot of people put videos saying they work and others dont. After some research i decided to take the risk and paid for:
Riptide GP 2
And they both work perfectly with controller support. No mapping nedded. Im glad i didnt waste my money. I downloaded MC4 cause it was on sale for christmas at 99 c so i said "what the heck is just a dollar" but it dint work.
Hope this helps