Vanilla is a product of Lussumo:
Documentation and Support.
With their previous models their screen had a resolution that was way too low
and they've always had bad customer service from what I hear.
Additionally, SSDs sound nice but they aren't quite a proven technology yet. There are a lot of studies done very recently that say that SSDs use about the same amount of power as a HDD and don't perform much better.
Plus, think about cost and disk space: you pay a whole heck of a lot more for a 20GB SSD than you would an 80 or 120GB HDD. A LOT more. And I don't know about you, but 20GB isn't enough space for me.