I was wondering if they were putting any old drive in there or if there were specific ones they used.
However, I personally feel if you're going to be paying $500 for SSD it better be damn fast. In that case, get an Intel X-25 and pop it in yourself.
But the cost to that is less capacity
Apple uses high-end Samsung SSD's for the Macbook Pro's, read and write speeds around 200 MB/s. It is equivalent to this part number MMDOE56G5MXP-0VB