Having a CC, I can tell you that it's not worth the money to buy. I got mine from my dad. He bought it years ago, and lost interest in it. He gave it me, and I have never used it.
BUT, I want to mod it so it works like another box cooker I saw somewhere. It's the exact same thing. With one big difference. The model I saw, allows you to cook like a UDS. It has the same steel lined walls, but it has no bottom. On the bottom it has two long coal trays that are suspended on two rods that run the width of the box. The coals are under the meat. The metal trays that are on the CC, are replaced with another piece of metal wrapped plywood that makes for a removeable lid. So, you access and load the meat from the top and you load coal from the bottom. I've looked everywhere for the pic but I cant find it.
HOT DAMN.......I FINALLY found the link. I would rather build a cooker like this one. I plan to mod my caja china to work like this one.
http://www.asadorcubano.com/testimonials.html