cheap walmart universal covers trump all.. they easly fall out of the packaging!! and work like a dream 
def against going naked.. my screen is scratched.. just from being in my pocket.. but i change my protector about every 3 months.. and under it.. still good as new.. but where its not cover.. is getting rather scratched up.. GG or not.. being in my pants pocket with my keys.. will tear anything upAnything that will scratch Gorilla Glass will go through a screen protector like a rock through wet toilet paper. I'm not saying it's impossible to scratch GG, but 0.1mm of plastic isn't going to stop whatever it is. Watch some of the YouTube videos; people attacking it with car keys, stabbing it with pens.
I'm for naked; the number of scenarios where you benefit from a protector is very small, and from the moment you put it on, it messes with the primary function of the thing it's protecting (if only slightly). Not a net benefit imo.
second this....my screen looks like a cutting board after 8 months of not having a screen protector.Good thing I always get insurance, and I hate how screen protectors just make glass feel like plastic....if I wanted a plastic screen I would have gotten a palm pre....def against going naked.. my screen is scratched.. just from being in my pocket.. but i change my protector about every 3 months.. and under it.. still good as new.. but where its not cover.. is getting rather scratched up.. GG or not.. being in my pants pocket with my keys.. will tear anything up