I love the idea of this; it'd be really useful to be able to weigh 4 things at once. For those who like to keep track of their meals/calorie intake, this could be a really useful item. And too many of us just eat anything, and everything without thinking - I'm just starting to think differently, and more in-line with this product.
This is one of those products where you think, 'why didn't someone think of this before'.