I can't comment personally, but from what I've read, you'll notice extremely fast boot times for the system and applications. Read/Write speed does currently deteriorate with time due to the lack of TRIM support:
But OSX 10.7 will add this. Formatting the drive would restore its read/write times but of course, if you're using it as an OS drive, that's hardly a solution.
If you search around the Avid DUC, I' sure someone had PT running on one of the newer Macbook Airs, and those have static drives for their system, so that might give you an idea of the performance increase.
Hope this helps!