Quite impressive, particularly the duality of wheels within a wheel. A big ball may work for Dyson vacuums but wheels fit a powered device better. Plus this thing looks good. ^_^ Wondering what the endurance/range is.
http://www.youtube.com/watch_popup?v=cuIJRsAuCHQ

http://www.youtube.com/watch_popup?v=cuIJRsAuCHQ