I've used the Android version some times ago. I remember using it to control Kodi on an old laptop I set up as a media player and not only I controlled Kodi but I shut the laptop down, controlled the mouse and keyboard with no problems. I almost never had to open the laptop and use it's keyboard.
I was asking for recommendations initially to control MPC-HC and PowerPoint Presentations, but this is much more than that. It's perfect!
The only cons I have for now are the not so clear UI (but I like the black theme, thanks for that), but I guess it could make it more beaufitul by embeding more of the Google's Material Design features.
The other thing is that the remotes still lack improvements, but I understand that as they're single devs.
I wouldn't think twice to buy the premium version as it's so cool with many features and surely to help the contributors.
Resuming: HIGHLY RECOMMENDED!