I recently bought a OWC 120 GB SSD to put in my early 2009 15" MacBook Pro. I initially installed it to my mac pro as an external drive to install Mac OS X 10.6 on it using the macbook pro's installation disk. It installed fine. I then installed SSD drive in the MacBook Pro. It booted up ok. But the longer I used it the more problems cropped up. Often spinning beach balls, delays starting programs. I cleared the PRAM what seemed to work at first but still problems, So I tried reinstalling Mac OS X again and start from scratch, but still all the same problems. I'm losing all the benefits from even using an SSD drive with total unreliability. I went back to my old HHD. It might be slower, but at least it works. I'm not convinced SSD's are all what their cracked up to be. Technology is not quite their yet.