I bought this product because of its sleek look. However, I started to notice problems the day after I started to use this case. The 3G connection on my iPhone 3GS would drop to Edge when my wife's iPhone 3GS would have no problem with its 3G connection. My cell signal would be significantly weaker (2 or 3 bars weaker) than my wife's as well. After few days of mysterious signal drops, I did a little experiment at work with my colleague. He and I both had the same model of iPhone with the same firmware and OS. When I took the case off my phone, the cell reception would grow stronger and I would move from the Edge to 3G. When I put the case on my colleague's iPhone, his 3G connection would drop to Edge and his cell signal strength would drop by 2 - 3 bars. I can not believe the case could cause severe interferences, but I guess I was wrong.I have not experienced any of signal difficulties since I took this case off, and I am using a difference case that does not cause problems like this.