I can't think of much not to love about the Roomba, but there's always room for competition in a market with one really great product.
So, welcome the Panasonic Fukitorimushi (Japanese for "wipe-up bug"), introduced recently at the Tokyo Fiber Senseware exhibition in Milan.
The Fukitorimushi (um, can we please just abbreviate it to "Fuki"? OK then) has a nanocloth underbelly, rather than a traditional sucking mechanism like a Roomba.
Its cloth-covered body kind of looks like you dropped a towel on the floor and forgot to pick it up, but I could learn to live with anything that cleans my apartment for me.