Works, but not very well

Im using this app with my 13 inch MacBook Pro as well as my iPad Air 2, and while this app works, it is very laggy and not very useful to me. Also, when I full screen something on my Mac, the display disappears on the iPad. The description says that the touch screen on the iPad can be used while using this app, but whenever I try to use it the app shuts down. I wish I would have never spent the money on this app.

Joshfisher59 about Duet Display, v1.2.3