I have been using Jack Black shampoo now for over a year.  I switched to Jack Black when Nordstrom switched from Anthony line of products to the Jack Black line.  Best switch I ever made.  First off my hair is thick (I am 43 with a full set of hair) but always felt somewhat dry.  Also, I am embarrassed to admit that I would get flakes during the hot summer months.  Since I went to Jack Black my hair is shinier and feels softer and no flakes at all this summer.  Smells great and it is easy to get a nice lather.  Will continue to keep buying Jack Black as I am the age where keeping all of my hair intact and looking nice is important.