My old iPhone 4S's battery wasn't holding much of a charge. Also, the back was getting fairly scratched up by dirt that would get stuck between by case and the phone. I decided to buy both the battery replacement and the transparent rear panel.
The repair went great. Only needed to remove a total of 4 screws to replace the back panel and the battery. Took maybe 10 minutes to finish. Clear back panel looks great. Unfortunately, I can't take a photo since the iPhone is the only camera I have at the moment.
Clear back looks great, definitely worth it.