I've been using a privacy screen on my devices for a couple of years now, ever since I started working in a cubicle farm.
Warning: this turned in to a bit of a long rant... if you don't feel like being preached to, skip to the tl;dr.
My wife noticed me starting to use it and she wanted on as well and so she's been using one almost as long as I have.
I would not continue to use a device from this point forward without having a privacy screen protector applied. We do so much on our phones now just anywhere we feel like. We have private conversations in public, we do our banking sitting at the lunch table with other people and we do internet browsing while sitting around with a group of friends. Do you really want people being able to see everything you're looking at?
And this isn't even about people looking over your shoulder anymore. The viewing angles on these phones (in general, not just an iPhone) and the screens are so large now that I can read someone's email on their phone sitting several feet away from an angle. I can see them put their PIN number in or I can see their keyboard light up when the type their password in.
I had one instance happen recently and where I was in a meeting and I was feeling snippy and I messaged my co-worker kind of a sarcastic comment. That phone was sitting on the conference table face up. It went off and that person didn't even notice it had gone off but the person sitting in the next chair did, read the message and looked over at me. I would have never had that problem with my device.
I understand how some people feel that it messes with your screen. It does. I couldn't count the number of times I've been frustrated because I wanted to take a picture but needed to hold my phone at an awkward angle and couldn't see what I was taking before I did. But for everytime I've had that happen there's been another instance when someone has walked up behind me and told me that they thought I was just staring at my phone because all they saw was a black screen.
Call me paranoid, because I also don't use Wifi access points that I don't have direct control over as well, but I think that in today's world if you're not seriously considering a privacy screen protector for everything that you do on your phone in public then you're not taking the security of your private information seriously.
tl;dr - Privacy screen protectors rock and you should SERIOUSLY be considering their usage in today's world to protect your information.
I haven't gotten my 7+ yet but my wife got her 7. I ordered Tech Armor's ballistic glass 4-way privacy screen protector and it was absolute ****. I'll get an album together a little bit later. Suffice to say that it should barely qualify as a 2-way privacy screen.
I saw iCarez had thier 4-way screen protectors up on Amazon this morning so I ordered them. They barely cover the actual screen and doesn't go to the edge and it's plastic and not glass but at least I know from experience that it will be private.
something I finally did let it go through 
