I bought the 128GB drive for my first gen MacBook Pro, and wow, what a difference. The whole experience is dramatically different from my old drive: I had gotten used to my Mac running relatively hot and loud, it's a weird feeling to be working away and to have it be so eerily quiet and cool. The best way to describe performance is snappy, like click and the action is executed with little or no delay. I got the drive for $250, and the price was definitely worth the significant uptick in performance, it really gave my four-year old laptop a new life.