Just awesome !!! The installation was okay and simple. For installation I had me a "Phillips screwdriver PH 2050, output: PH 00, blade length mm: 40" ordered. Had previously looked on the Internet, which fits well for Apple screws. The memory runs really no problems. Boot process was faster and the desktop is also very fast there. I'm very satisfied and it can only recommend that the Apple demanded the price in the store, do not want to pay.