Just got my little 245 today and it did a noticeable job on the floor. I got rid of any large debris and then used a dry mop pad first just to see how well it would do and it did a monumental job, the floor was dirtier then I thought. After that I hit it with the wet pad and it made the floor nice and clean. I'm so happy that I finally got that little guy. I just wish it was a little easier to track down.
Just got my Braava 240 mop and I love it! I've already moped my kitchen floor twice (got my Braava mopper 3 days ago) and it's fresh and clean! Sure it misses some spots and it may not do a super fantastic job but it's easy to just run it again or more often. The Braava is a great addition to my Roomba armada!
Pros: Cleans Effectively, Cleans Under Furniture, Easy To Use, Hassle Free Operation, Long Run Time
Cons: can't get really good around table legs, etc
It's great how the senors work, even though for it to know there is a wall it has to crash into it. Scared me at first but it still works and if it ever does break while cleaning and crashing into walls it is covered by the Manufacturer Warranty! But the results of the cleaning are spectacular!
Pros: Cleans Effectively, Easy To Use, Hassle Free Operation, Long Run Time, Not Noisey