I was looking at this one:
H20 Mop, Converts Water into Steam | Solutions It's the H2O mop.
I saw it on TV, and it said it was safe for hardwood floors (mine are sealed). Although, after reading many reviews, a lot of them said it worked great -- at first, but then they just stopped working all of a sudden. So, that is why I wanted to hear from the people that have them and like them, or not.