The old white back was getting pretty boring and I wanted something that could make my iPhone a bit unique. The transparent rear glass panel is both pretty and leaves everyone in awe. It's amazing how you can just flip over the phone and it's like you're beginning a teardown each and every time.
The repair was pretty easy. I purchased the iPhone 4 liberation kit which was cheaper than purchasing the pentalobe driver alone. It was overall an amazing deal.
Not really. Just make sure that you are extremely careful with the drivers that come with the liberation kit. They are extremely fragile considering they are only supposed to be used once. However, I'm still using them to perform repairs for my friends because after I purchased and installed it, everyone seems to want one and they're too afraid to remove two screws!