I put a full body Ghost Armor on mine. Clear. I had it put on at the mall and he did a good job. If you just look at the phone you can't see it. I thought I would go with nothing but I don't treat my phones too well, I throw them down anywhere, drop them in my purse or pocket, etc. while I doubt I would scratch the case I feel better about having something on it so I don't even think about it.
A big plus is now I can actually lay my phone on my hand and tilt my hand about 85 degrees and it doesn't slid off so even though the skin isn't 'sticky' it does add a bit of grip. Hard to explain but it did feel like I might drop it at times. May all bein my mind but now I feel like I have a better hold. One more added plus, fewer fingerprints.