Happy with ShaggyMax
I have the same concerns about scratches on the screen. And, if I spend 2 grand on a laptop, it better look great for the next 3 years!
I have read too many posts with complaints about this issue to take a risk, so I bought a competitors product, ShaggyMax (formerly ShaggyMac) that looks pretty similar. It fits perfect on my late 2013 rMBP 15 and I don't have any issues closing or opening the cover. I did see some reviews of older versions that said some cloth colors like black did cause some color transfer to the older plastic MacBook cases after extended use, but I didn't see anything specific about the current aluminum chassis. But to lessen the possibility (or visibility) of color transfer, I bought the gray cloth.
I have used ShaggyMax on my rMBP and earlier on my MB Air for a couple of years with no screen scratches. Count me as a yes for protecting the screen.
I also understand that Apple has been known to replace the screen because of scratch issues under warrantee, but I would rather not go down that road unless I have to.