Sure, you could argue that this is a piano that happens to have an iPad dock built in, but I think you'd have that backwards. It's clearly an iPad dock that just so happens to have a piano on it.
The dock is set up so you can easily read sheet music on your iPad, which is nice. But you can also do so many other things with your iPad, like surf the web, check email or play Angry Birds. Meanwhile, the only thing you can do with that piano is play music. Bo-ring!