Well I picked up a pack of screen protectors from Verizon in store. The 3 pack, worked out took one for me, my wife and my brother. All applied well and easy nice smooth dry install. No air bubbles. Couple of dust particles and cloth fuzzes that made it under, but nothing end of the world status.
When you wipe the protector with a microfiber cloth good enough it looks literally just like the naked glass. No way of discerning there's a protector on. So aesthetically it is identical to going without a protector. Touch wise, the Verizon protectors have been consistently "smooth" from phone to phone. This one in particular has a nice cool smooth touch, very similar to the glass itself. Not 100% the same, but definitely 95%+. If it had any effect on the S Pen at all, I can't tell the difference. Air View, contact, it all works the same to me. And I am VERY picky and alert to differences. In fact I am quite aware of the fact that my screen has some terrible yellow tinting going on. Wife and brother lucked out, my brother doesn't even have the notorious AMOLED ink spots. I got those AND a yellowish screen nice just my luck right lol.
Anyway I would never trust a $700 device to go naked and toss around for daily use. It's always better to play it safe and bundle your phone up with a case and screen protector. I can especially recommend the Verizon ones as unless you really go to town with a knife or rock etc, you aren't going to scratch your screen with this one and it comes with none of the negative side effects that most protectors carry.