Happy past Birthday to you! I stopped celebrating my birthdays at 29, it was my last. To me, it's just a new reminder that I'm one year older, nothing to celebrate really. :)))

What you got yourself there is so much more than a simple piano that you were looking for, that's a complex sound machine, I've seen some demos done with it, many techno/house Djs use it.
Let us know when you launch your first demo! :))

btw, a new one goes for about 500euros around here.