Basically so the kids can help themselves to fruit as they can't reach up to the fridge and their constant demand for snacks is driving me mad!
I remember having one when I was little and it was great for helping myself to fruit and for letting fruit ripen.
But I also remember mealy apples and mushy grapes and fruit flies in the house.
Also, are they a bit naff? I've never been to anyone's house in the last 20 years who has one.