A:Answer“The Nimbus Wireless is a full-sized wireless controller, compatible with Apple TV and many other Apple devices.” This statement is direct from Apple. There is no claim that it works with other systems. I would seek a product that claims compatibility.
A:AnswerThis works only with iOS devices only, so no, it won't work with an Android device. For Android, I'd go with the SteelSeries Stratus Duo Wireless Gaming Controller for Windows, Android, and Select VR Headsets...
A:AnswerIt will work on your iMac. No additional drivers. Just connect through your bluetooth settings. If you like Xbox One or PS4 controllers, don't get this. It's missing the Start/Select buttons & the L3/R3 buttons. Extremely annoying if you play FPS games like Destiny or COD. I also hate how close the thumb sticks are together. I constantly hit my thumbs together causing me to mess up pretty bad. Great quality of build, terrible button layout and missing functionality. Spend the extra $15 and get a PS4 controller or get one when they go on sale next week for Black Friday.