Yeah, it is great! Really easy setup, though a little unstable (it is a beta after all). If you know basic CSS you can modify the themes directly in the web interface, and it isn’t too hard to create your own once you understand the structure.
Only using my iPad Mini for sketching and a small amount of light gaming. So, like 85-15 Mac-iPad. Have abandoned real paper for Paper (the app) and a stylus, and have never been sketching so much in my life.