Just for info for others that may be interested next year, I attended this on Saturday and it really was a good day out, if rather expensive.
It did help of course that the weather was perfect for it.
There's plenty of free samples of food and drink, and if you push yourself you could get enough to save you from buying your own!!, but if you do decide to buy some food or drink it tends to be very pricey, especially the signature dishes from the 'top' restaurants. I did buy a couple of these and they were scandalous for what you got, but since I am someone who would never be able to afford to go to these restaurants for a full meal, I wanted to see what I would be missing.
And just seeing the massive crowd milling around all day at €28.50 each for entry (at least) made me realise how much of a money-spinner it must be.
But overall a good deal out and worth experiencing at least once.