This package lets your Android game enter and exit full-screen mode, hiding the navigation bar present on devices without physical keys. Unlike most implementations, this works fine with touch screen keyboards.
The asset has proved to work on many devices.
Unity 5 has added immersive mode by default, so if your using Unity 5 or above, this package is redundant.
Immersive Mode requires Android 4.4, lower versions remain non-full-screen. It works perfectly fine on Android 5. The plugin will not conflict with other plugins, since it does not require a manifest.