The first time i bought this product, it worked perfectly and i was 100% satisfied. This lasted for about 8 months as one day i went to the car and found the holder on the floor; the suction bit just failed and stopped working. It was over the winter period and i think it might have been the freezing temperatures that caused it to fail. I probably shouldn't have left it constantly attached to the windscreen.
I was however that pleased with the item that i have now bought a second one. Contrary to what other posters have said, it fits the iPhone 4G perfectly and causes no scatches if used correctly (push the little tab back and slide phone out)
Anyways, if you're looking for a cheap, practical iphone 4 holder, this is definitely one you should consider, plus it comes with an in car charger! What a bargain! Except i have two now, lol.
Anyways hope this review has helped you make your decision :)