I've used iTeleport and it's the first app of this kind that I have seen make smooth transition of a touch interface to a point and click interface.
It's transparent and intuitive, you drag the cursor using any part of the screen rather than trying to actually touch the actual cursor. If you've not used it, it's important you understand what I'm trying to say because when you have to move the cursor by physically dragging it with your fingers, you end up covering the areas of the screen your trying to use.
A single click is just a tap (again anywhere) and a secondary (right) click is a two finger tap.
I did trial Screens because I was lured by the similar nice looking UI to iTeleport and they promised an excellent control interface for touch devices, but I couldn't even work out how to do secondary right click so I stuck with iTeleport as I've never had to look up how to do something and that's a great benchmark I think!
Someone will probably come to Screens defence and explain how simple right click is and I admit I didnt persevere with it, but when you already have a very, very good app, a potential replacement must have significant additional features and also not give you the slightest reason to reject it 🙂