heavenlywild: There has been reports of backlight bleed on many SP4s. Can anyone with a SP4 comment on this?
Apparently Microsoft are aware of this issue and has rectified it in their newer stocks.
http://forums.windowscentral.com/microsoft-surface-pro-4/401864-surface-pro-4-backlight-bleed-microsoft-aware-apparently-fixed-issue.html
Yes I've got some on the bottom edge of mine.
Edit two: I just fired it up in normal light conditions and you can't see a thing, even on the boot screen and not on an entirely black image full screen either. But I do remember distictly seeing it in a fully dark room while testing for dead pixels with a black screen; probably for the test I would have had the brightness on full. Since then I've watched a bit of video in bed and didn't notice anything.
So mine at least isn't noticeable unless you go looking for it.