However I think each of these is much less expressive than actually having the Pencil, Marker, Paint brush etc..

These don't provide nearly the versatility, such as levels of shading, that the real tools do, but the convenience of having some form of all of them in one small "pencil" is extremely nice.

If your end goal is to produce good art on paper, I would probably not start here, but for having fun and developing an interest it's been fantastic.

Now that I think about it, maybe it is the "Undo" feature that sells me =)