I tried Surface. Really, I did.
Couldn't figure HOW I could use it.
OK, you put files, links and stuff on a pad. And then you can link them together with some arrows... Oh, and you can add notes not your files.
And then what?
I wasn't able to resize the pad (only move it) so it's jamming the full screen. Then, Appdelete went to my rescue.
I tried to undertand. I really did. Guess some users will like/need these features. But I didn't.

The concept is good. I like relations but the documentation and implementation seem to be not-quite-mature. Project stacks would be nice. There needs to be some visible indicator if notes are attached or relations exist while items are not selected. I would love to be able to know where my work is at at-a-glace with notes rather than having to sift through files. The surface needs full keyboard access that is smart and natural- think spotlightish. Needs animation (toggleable). As soon as a note is created the focus should move to the textfield of the note. I can't get the bring-surface-to-front key command to work. The same command should hide it. Line color, especially opacity should but changeable. The close circle should be hideable. There should be an option to hide surface when it doesn't have focus (to be invoked again by key command). There should be an option for a stack or recent files.

Dreams dreams. Lots of work to do, but here's to a first release.
Ed