Personally, I love the sound of that look and it's something I always aim for. The suggested technique is "spray evenly through damp hair and dry naturally or with a diffuser." I've tried it a few different ways. First, I sprayed it on damp hair and used my hair dryer whilst fussing with my hair and trying to tease some curls out of it. I tried the same thing but with towel drying instead.
Next I tried it on damp hair & dried it with a hair dryer, but this time I didn't fuss around with my hair. Then, I put it on damp hair and went to bed. Thennn I put it on damp hair and left it to dry on its own for a while.
The result was always the same - a let down. All it did was make my hair smell nice and change texture a bit. It could be because I have quite thick hair, but if that's the case then they should say it's suitable for fine hair rather than "All hair types." I'd say it's worth a try if you have thin hair because it does seem to have the potential to be a really good product.
I got mine when Boots had all Umberto Giannini products for 2 for £5 but you can get it from boots for £5.61. It has a few good reviews on the boots website so I think it's just my hair being stubborn..