I really like this mousse.  It makes my hair more voluminous and gives it some added thickness.  I can definitely tell the difference when I use it.  It adds tons of body and a nice amount of hold so that when I use the curling iron my waves stay in place for several days.  I'm pretty generous with the amount I use because my hair is hard to hold so I need the extra oomph and control.  I then let my hair air dry overnight.  In the morning it's a little stiff but it brushes right out and once I've done the waves, it has plenty of bounce.  I finish with Bumble and Bumble Thickening Creme Contour, which adds a little bit of hold but also some additional thickness and separation.  The two products together are awesome and my hair has never looked better.  I don't even need to recurl it on the 2nd or 3rd day because it stays in place so well.  I've tried other thickening mousse formulas but always come back to this one.  It gives my hair some added heft and dimension and the volume is terrific.  Who could ask for more?  This is an awesome product and great for fine hair.  If you're looking for a product with a thickening effect, then you can't do better than this one.  I definitely recommend it for all hair types.