The good thing about the Copperhead is that the calipers are tapered and are small. I was just looking at some pictures and my hand is tucked tight against my face withe the barrel of the release against my face. Look at the difference between the calipers on the release you posted and the copperhead attached. Because the calipers aren't even in parallel with the barrel upon release it shouldn't hit your face. Small and tapered. I had a trufire that had large calipers and had issues with it hitting my face when I released.

TFOX has stated a lot of good reasons to look at a single caliper. I've read a lot though that the single is supposed to be smoother and easier on the string and most of the shooters I know use the single caliper.