Dry Shampoo Spray - Does it work?

I saw this dry shampoo spray product today that you can spray into your hair in case you need to save time and dont feel like washing your hair.

It's suppose to soak up the oil in your hair and leave your hair looking freshly washed.

I was about to buy it, but had second thoughts... does it really work??! Because if it does, I think its a great idea!