Parameter.Value (New Node) [statement not question]

I was cruising right along working out a process to calc window to wall ratio in Revit 2017 and saw Parameter.Value, awesome, using it with List.Map to transfer from Host Id to Elements. I know this can be done another way but I love that it is now so easy.

I then opened the same .dyn in Revit 2015 and falls flat on face no such node :frowning: That’s what I get for working out a new process in latest version when office is mostly in 2015.

Also, enjoying the input level controls. I am sure there are other uses, but this works for me right now.