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Karcher has also a robocleaner thats looks really nice.
A plus of this device is that it will go to it's station when it's bin is full and empty it there. After that it will continue cleaning.
The downside is it's price of 980,-

http://www.robocleaner.de/robo/english/english.html

Video at

Options are great, I think its also a very good device.
Other downside is the huge dockingstation!