My wife bought me one of those last Christmas. I haven't done much with it outside forcing it into slavery as guard-dog on top of my beer fridge. His collateral duties are paper weight & D-cell battery exterminator.

I made a little IR-to-RF converter for long-range control, and it was really fun running him up & down our street for a few days (500 D-cells later); pestering the neighborhood cats & dogs. The lady next door asked us to cool it. She's already having to borrow money for her dogs therapy as it is, so we retired him to less exotic excursions.

Mark Tilden (the designer) left the control design very open with the intention of folks hackng it to add more capabilities. They are popular.

P.S. I do beleive they have some Robo-Extender accessories that allow no limit expansions of that 12" limit too...;o}