I second the Mopar ignition-keyed gas cap and Mopar fuel door. I put that combo on mine.
I was more concerned with fuel theft, but I was reading some complaints (somewhere, can't recall the forum right now) about crud building up in the ignition-keyed caps and the lock failing after a couple of years -- necessitating the vice-grip removal method. I got the fuel door primarily to protect the cap, although I do like the appearance of it.
FWIW, getting the cap keyed to your ignition key can be an adventure. I bought one for my wife's 2011 and the parts guy keyed it with no problems.
When I got one for my 2012, the parts guy keyed the cap again, but messed it up (I think the pins in the pin kit got rearranged somehow), had to remove it with vice grips, and then order another one for me. End result of that was the dealership forbidding the parts department from keying the caps and forcing me to make an appointment so a service tech could key it instead.
I've had no problems with it and I found it was solid enough for my use. I like that I don't have to lock it, there is a magnet that keeps the cover closed. But I have a Key in the jeep that I can chose to lock the cap should I feel the need to. Amazon says "Some drilling required" in the description but I did not need it.
I bought the $30 mopar locking gas cap when i got my JK. With a 18 gallon tank i am mainly concerned about fuel theft and it wasnt worth a extra $50 to me to have it keyed to the ignition key, im ok with carry around another tiny key.
I just ordered this and didn't realize until it was too late that it was coming from China. Did you have any problems with it? Guess I should have read all the way through the thread! Oh Well, we shall see...