I am getting a lot of css warnings and the styles from dmxNavigationMenu.css are not validating. I do have the menu output modded a good bit (nested repeats to populate drop downs and static as well as dynamic links) but I didn't modify much of the css apart from colors and background images. Id rather not post a link to this development site on a public forum but if you would like to see an example shoot me a pm (if you can?) and I can provide a link.
.dmxNavigationMenu li Property zoom doesn't exist : 1
.dmxNavigationMenu ul.horizontal > li Value Error : display -moz-inline-stack is not a display value : -moz-inline-stack
.dmxNavigationMenu ul.horizontal > li Property zoom doesn't exist : 1
.dmxNavigationMenu ul.horizontal > li Parse Error *display: inline;
.dmxNavigationMenu ul.sub Parse Error [: bottom; } .dmxNavigationMenu ul.mega]
.dmxNavigationMenu li a Property zoom doesn't exist : 1
.dmxNavigationMenu ul.horizontal > li > a Parse Error *display: inline;
.dmxNavigationMenu ul.horizontal > li > a Parse Error }
Still, this is a good product and was very very helpful in creating a dynamic menu.