I have it running quite well on my Amazon FireTV stick 4K. I sideloaded the APK from the Poweramp website and was able to pay for the full version via PayPal from within the app once it was installed. I have to use a mouse (bluetoothed in) in order to access some settings. Once all the settings are set, the fire tv's remote works just fine. The only other thing that is a slight annoyance is, its a little difficult to see selections. The "halo" that shows up around an item when it is selected isn't as visible as I would like, but they're there. I am super happy with the results I am getting on the firestick. There really isn't anything comparable from Amazon, so I'm glad that Amazon doesn't have things locked down super tight.
