Update Oct 2015 - Having tried a variety of these thicken products now I would recommend this. It is a bit sticky but it does do the job if you go easy on it. It gives a nice finish even if it does cost more than the average.
I love all the other B&B products I've bought so I was willing to give this a go at the full size instead of buying a trail size. I use the Prep Spray which is excellent and this is the product it suggests on the bottle for a 'total blow dry'. I'm really disappointed. It is glorified sugar water. It gives a bit of body but then leaves a sticky residue and limp hair which was difficult to style. Maybe leave to the professionals and try the much cheaper Mark Hill version.