You could potentially build a commercial version of this on the same technology, if you wanted to keep the core of it lean. I know several people that would pay money to have this plus analytics about user progress and drop outs, user feedback etc.
I can't speak to the other one, but I will go on to say that Taurus is moving very fast. I was an early adopter, and while I don't use them anymore, I saw them go from a barebones product, to a barebones product with an on-site tutorial builder, to a fairly rich product with customizable themes, etc., in just a few weeks.
I can't speak for what they've done since I stopped using them, but looking at their homepage, the velocity still seems pretty high.
