Thanks. I understand what SSD is... I just think Apple is being very unclear with this spec. I work for a web development company and each person that has a Mac (except me) has upgraded to an SSD in the last month or so for a really reasonable price. I'm going to be thoroughly irritated if my new Mac doesn't either come with a SSD or at least allow for me to install one myself.
Flash should be as fast as SSD. You will not be able to change from flash to SSD though.