Our two 8’s are in Otterbox Strada Series Folio cases (plastic, not leater ones) on which the cover protects the screen.
A couple of points, which we have learnt to curcumvent to some extent: 1. It is quite easy to cover up the camera with the screen cover, when folded back and 2. Pressing the left hand side of the screen, in order to show all open apps and hence switch apps, is not easy and in fact I rarely use it. (It is a great pity that that function cannot be switched to the other side of the phone,)