I really like ghost armor and had them armor my phone in Yelp Red. At least I tell everyone that's what color it is :) I usually am on yelp anyway so it might as well be yelp red.
I personally suggest that if you're thinking about armor, to get it done soon after getting your phone. Saves from gathering scratches, gives a "bit" of a shock absorber and looks super cool to boot - the colored carbon fiber will run you an added $15 (i think) on top of the $20 or so it is for the armor and then another $10 or $15 for them to professionally install your armor.
Ive had 2 phones armored and they once messed up the button on the phone; the pattern didn't on the carbon fiber shell didn't match up to the rest of the phone. I asked them to adjust it and they were happy to fix it.
I wouldn't make an official claim that ghost armor will protect your phone from shattering. #1 because I don't work for them and #2 because its probably not 100% true, but Ive never shattered the glass on my iPhones, nor has my wife, and we've both been through 2 armored iPhones in the past 5 years. Maybe were just careful, wait that's not right, our phones drop once in a while just like everyone else's. Maybe its just lucky placement of the point of impact when the phone hits the ground or maybe its the extra bit of coverage you get from the armor - you decide.