This doesn't answer your question but a friend of mine is a Apache pilot and he told me that it is just awe-inspiring to watch the destruction that an A-10 can deliver. I'm sure his Apache can open a can of whoop-ass, too.
I've conducted live fire Joint Air Attack Team missions with A-10s from the front seat of an AH-64. One of my best memories. I also served in the infantry soon after the A-10 was first fielded and conducted live fire CAS training missions with them. I have a special place in my heart for A-10 drivers and the machines they fly. They are "different" from their Air Force brethren and totally focused on supporting the ground commanders' battle. Meat Eaters, each and every one. It's a damned shame to watch this awesome platform being phased out. Nothing super fancy about it. Just brute force combined with subsonic, low altitude ballet and can take a beating.