I'm tempted to go this route for my 6 but am afraid the lip won't offer enough protection.
Interested in a year of use, not 36 hours.
I have used the Apple case, or cases like it (with raised lip) for 4 years without any scratches on the glass- no screen protector.
A) The raised lip protects the screen for lay on the table - if the table roughness is less than the dimension of the raised lip.
1. if the table is not less...then the plastic screen protector could scratch...or your glass screen protector too. The latter being expensive to replace. It depends on the table material hardness.
B) If you drop your phone face down onto the ground, the same rule applies, with one difference- if a rock or gravel is smaller than the surface area of the raised lip, the screen will stand a good probablity of cracking...with or without a screen protector. i.e. drop it on a sharp 1 inch stone, and no raised lip or screen protector is going to prevent a sharp pointed break, glass or plastic.
So with that thought, for a guy, carrying his phone in a loose front pocket, with nothing else there, is pretty much protected via the pocket material itself. Just keep your pocket clean of sand and dirt, without going OCD.
For a ladies, carrying a phone in a purse with loose stuff, or one that uses diamond ear rings, well a protector would be a wise move. But diamond will scratch anything including your expensive glass protector. Otherwise have a dedicated pocket in that purse. and it is similar to a guys pocket.
So I feel that screen protectors are unnecessary and by using them you remove all the advance tech in the Apple screen, AND add another light reflective interface that decreases screen contrast a little bit.
Having said that...tight back pocket skinny jeans...one never knows how clean they are, so slipping a phone into a pocket that could have dirt or sand somewhere, will scratch your screen and protector...being that sand is just ground quartz or glass like, and the same hardness as the screen, and that will cause hairline scratches in the glass or the oleophobic coating.
It is important to remember it is both sand, dirt or whatever AND how hard or how much pressure is applied before something scratches. One can use sandpaper on a piece of wood for minutes, but if you apply no pressure while sanding it is not going to scratch much. Which is why skinny jeans can be worse that loose pockets.
Loose fitting pockets are the best. Okay, I stand off of my soapbox