Hereafter are the benchmarks performed with the Intel X25-M. As a reminder, this 80 GB SSD is still expensive, with a retail price around 650.
If you want to compare it to the 128 GB Samsung SSD installed by Apple as a BTO, the corresponding benchmarks are below:
As one can easily see it, if both SSDs obtain similar results in writing mode, the Samsung SSD is almost 2.5 times slower than the Intel model in reading