Like many buyer I had difficulty in deciding me for this purchase. I had already changed the battery of my iPhone 3G by Blue Star Premium a year and a half and we had already put it off. The operation is not very complicated but still need to find "the" battery as history means more or less happy about it. In short! For the price proposed in this kit gives value for money. The battery seems good manufacturing and tools have been very useful to me to share the sucker that I was not allowed to start the maneuver. Indeed it has no suction power, it is deformed and an uneven finish if it adheres nowhere! I have therefore used another I had fortunately in stock. Bottom line: my iPhone 3 GS is reassembled over and everything seems OK.