Review: Aussie Miracle Dry Shampoo

I picked this relatively new dry shampoo from Boots about a month ago. I love Aussie as a brand, especially their Three Minute Miracle Conditioners. The products smell delicious and I was thrilled to see that they had branched out into the dry shampoo market.
I chose the Mega Instant version for normal to greasy hair. It is also available in a formulation for coloured hair and one to give volume. 
The price is really competitive (little more than £3 when I picked it up), so I felt I had nothing to lose.