I downloaded R2 onto my Kindle Fire. The program works extremely well. I realize that this does not make sense, but the Crestron system being controlled by R2 seems to me to operate even faster with the R2 App on the Kindle, than the Crestron App on our iPads.However, With the Crestron APP I can share it on all my apple devices. I have not figured out how to load the R2 on more than one of my Android devices without having to buy it new each time. If you can use the one purchase on four or five of your home devices, I would strongly recommend R2, as the value proposition would be high. Without that ability, I would not purchase R2 again,