Do you use free blogs like blogspot or create your own, like wordpress?

I like the idea of free blogging and am sure google is not going anywhere soon, but still, you ultimately have no control if things change. Am I correct in worrying about this? Do you "high roller bloggaz" use the free or pay the /yr for an addon for every blog you run? Also, is it a lot of work to transfer later, when u start making enough loot?