Not only do you get a great app that allows you to turn that ipad into a 2nd screen, but you get amazing service and support as well. As far as app developers go, the CEO replied to my emails about support when I had an issue running a beta. Customer service is why I gave this a 5 star rating. Its a component that is often left out of business and its nice to see that he takes it seriously.
ChristopherGuest about Duet Display, v1.2.3