9/10 is when I have used the program, fallen in love with it, and will use it forever.
9/10 = This is perfect for me.
As I said, the whole experience is subjective. I can only rate something based on it's usefulness to myself.
I believe nothing is perfect, so 10/10 is theoretically impossible...to me.
9/10 is theoretically possible, but highly improbable.



