I have been so tied up with learning the Android language and just general stuff that has nothing to do with the N4 that I did not really put two things together that might be interesting to some of you here.
As has already been noted here, the Zerolemon tempered glass screen protector does not cover out to the edges of the N4 screen only covering the flat portions of the screen. We all know the Zerolemon has a halo. While Zerolemon does not offer a spec at least not one that I have seen, I think this must be one of the 4mm thick glass protectors.
I mentioned early on that the Zerolemon does not have a cutout for the selfie camera. Frankly, not much of an issue in my case. However what I did not notice until just today was that the halo goes right through the location for the camera lens. Now I don't know of any other protector that gives us the opportunity to look at this issue from the perspective of the camera lens. However some of you might be happy to know that I can see no evidence of the halo when looking through the selfie camera lens. I have looked really hard and while the halo is very small on the zerolemon even to the extent that at some points, the halo is a broken line, I can surely see it cross through the camera lens when I am looking at the entire screen. But try as I might, I cannot see anything of that halo when activating the selfie camera and looking through the camera lens.
We are stuck with this generation of tempered glass screen protectors and for all I know, it may never get better than it is as far as further product development is concerned. But it might just be that being able to see the halo when looking at the entire screen has really left a bad taste in our mouths. The actual practical impact of the halo may be far less than we anticipate.
Now at least for me, I would not want to spend upwards of $40-$50 for a protector and even have a halo of little practical impact. But many of us are paying less than $15 for these things. They may just not be as bad as we anticipate.
I am not by the way suggesting people go out and buy a Zerolemon tempered glass protector. However the fact that their protector has no cutout for the selfie camera lens is what has made it possible for me to at least offer you a comment that might help you with this stuff. I for one would hate for somebody to pass on what is relatively inexpensive protection and then end up with a scratched display screen because they anticipated a really bad performance experience due to the effect from the halo. Heck I cannot even say with any confidence that the halo from a different protector would in fact be more telling than the one from the Zerolemon.
I will say this though. I would watch for dust building up on the edge of the screen protector. I would not want to have to use some solution to get real grunge off of that edge. But I would be watchful for the dust and do something to get rid of it while it is just dry dust. Maybe even canned air with a nozzle will blow it harmlessly away before it mixes with some moisture and hardens along that edge. I don't think it takes much of an effort to just get the dust off that edge at least once per week.