Yes I tried a flip cover but it also has it's limitations. I used it on my S2 for a month.
It got stuck in my shirt or pants and it is also difficult to keep clean.
Note 8 is much bigger so it is going to be a nightmare fitting it in a pocket if it has a flip cover. I also imagine one handed operation is going to be very difficult.
As a matter of interest I wonder if people had a choice (given all the discussions wrt the benefits of having a curved screen, covers, scratches ext) would prefer the curved screen to the normal screen.
Maybe I am part of a small minority and most people like the curved screen then I better zip it. LOL.