Fast and reliable. However the setting up is not so simple. The first one was mistakenly sent back because technical support from Amazon and Samsung are incompetent in guiding me on how to configure the OS to recognize this SSD and have assumed that the SSD arrived dead. However, after receiving a second piece and still face the same problem, I seek help from friend and got an article on how to configure the OS correctly so that the OS could recognize the SSD. Work great now.