Let me start by saying this is the most amazing product ever! When I first bought the sweeping irobot, I joked that they needed one that mopped. When they came out with one that mopped, I had to buy it!
The Scooba is a mopping robot. You fill the chamber with either cleaning solution, that you can buy from Irobot or a mix of vinegar and water. You turn the scooba on and it not only mops your floor it also dries it. And yes, it does a great job. It covers a very large area and has enough battery power to do multiple rooms.
The price is a little steep, however, irobot has great customer service and warranties. This is truly one of the best purchases I have ever made!