I would definitely want the biggest one available (for a MAC of course!) to store the zillions of pictures my husband takes (and all of the movies that he rips to the hard drive!)
The biggest mess I've had to clean up lately was a bottle of maple syrup that my (then) 2 year old poured out in his room. I used the steamer and lots of towels to clean it up.
My hubby would love this. He's always looking for new tech gadgets. RIght now, if I want to listen to music, I have to crank the speakers on his computer. And then it's blasting when I come back into the bedroom.