Keep in mind that as soon as you start using your SSD, it is going to slow down. Some are worse than others.
Also with Sandforce drives, the amount their speed is determined by the type of data that is on the drive. More compressed data (archived files, videos, pictures, mp3s) = slower performance. Less compressed (Windows files, exe files, etc) = better performance. You can read more about this on the bottom of
page 6 of my SSD review.
Typical data in your "program files" directory is about 45-55% compressible, which is what I use in my SSD reviews. I find this reflects best real-world performance. You can see the results on page 7. Remember that read performance is more important, since when you are loading programs, etc, most of the operations are reads.