I did and it works okay but I had one or two of them and the problem is, if you have that shield and try to put on another case it is hard to get rid of it or take the case off. Believe you me.
Just get a screen shield and a ifrog case they work wonders I dont even have a scratch on my apple icon on the back.
I have one on my 3gs but the protector is slowly peeling off from the side. I will have to get a new one soon. The zagg protectors protects stratches and is way better than the protectors I tried from ebay.