I love JF products, they are expensive but well worth it. These products don't leave build up on your hair and your hair feels clean afterwards. My hair was not dull after using it either but of course the volume part does not work for me. This has nothing to do with the product but everything to do with my hair, my hair is just above my bum and honestly no product is going to give that length of hair volume. The only way to create volume is to cut my hair or layer it a bit. Blow drying with some mousse also does sometimes help.
I love the smell of JF products and do believe that your hair lands up in a better condition when you use good products on your hair. Healthy hair is something we all want, no one wants to walk around with dry split ends and lifeless dull hair