For years the Super Drive in my Macbook pro did not work so it was litterally wasting space. Instead of just replacing the Super Drive I decided to go a more extravagant route and install a second drive (for cost reasons the second drive is a SSHD or Hybrid) . I also wanted to upgrade the traditional disk drive with an SSD. I also replaced the battery in my laptop as my MacBook Pro is 4 years old and the battery was cheap. I already had maxed my RAM last year to 16 GB so I figure why not just upgrade the laptop to be a beast!
The repair went smoothly for the most part. Some of the smaller screws where hard to get back in place and I broke a small plastic piece off where a screw held the logic board together. It can be difficult when unscrewing the entire laptop however iFixit has awesome instructions and tutorials!
I first replaced the Super Drive with the Unibody kit and put in the new battery to make sure both of those worked well. I then added the SSD as the main drive.
Upgrade to an SSD if you can it will improve your performance dramatically. On hindsight I should have just gone with a second SSD instead of the Hybrid drive. I will probably swap out later which brings me to the next part, the Unibody will require you to remove the entire frame to install the new drive if you upgrade. Not really a con but more of annoyance if you plan to upgrade later. Check the battery, I had to Dremel one of the screw holes because the battery was not able to hold both screws properly when screwed in.
Check it out on Facebook, I shared this post publicly so anyone should be able to see it.