I haven't had a dropped chain or chain suck, or any chain problems for that matter, since I switch to my XX1 setup. However, I did put some clear Gorilla Tape on my chain stays because my heels will rub the chain stays sometimes. Gorilla Tape is thicker than regular clear tape and has a very sticky adhesive. It's the cheapest clear paint protection I have found. If you want something a bit thicker, but more expensive, I've used the Lizard Skin chain protector, it works well.
Although, the cheapest solution is to wrap the chain stays with an cut up old inner tube or rubber rim band. I've don that as well, cheap and easy to do.