I recently purchased an invisible shield for my iPhone 3gs, but now I’m second guessing it. I bought a Case Mate invisible shield but it was difficult to install and very stressful. However, when it was finished I enjoyed the protection it provides. If you have an iPhone 4 it will not solve the reception issue because it only covers the front and back. More protection is never a bad idea ,but you can get more for $20. Let me know if you would buy an invisible shield, or if you have one leave a quick comment on your experiences.
Zane