The superdrive on my MBP gave up the ghost a while ago and I went without it for a while. Eventually I decided I needed to do something about it and on a whim searched for replacement drives. I found iFixit and after a little reading decided to go for it.
Easy to replace - but also very easy to lose the little screws that you remove from the computer.
Keep a nice bowl handy to hold all of the loose screws while your in the thick of the replacement.