I like that we don't have to do all-or-nothing of any one approach. We're much more "unschool-y" than we were when we started, though the full-on unschoolers that I know probably wouldn't see us as unschooling. But I know a few people who call themselves unschoolers who do very much what we do: something along the lines of "Math time! What do you choose to work on today of the possibilities I have here for you? Or would you prefer to come up with a project of your own?"
With kids who crave learning and love a challenge, this really seems to me to be a good approach. It's certainly not for all kids, but if you have a child who wants to learn about everything and doesn't run away from hard work, I think it's a pretty good plan.
It's also nice because if the child *stops* wanting to lead the way, it's always possible for the parent to become more directive without it being a big deal. Something along the lines of "If you don't care, I can choose something for you."
YMMV, of course...
