I had to set up both. I have a company profile workspace "just in case", and I have a lisp routine that will populate the menus back to the original, in the event someone really messes things up. I hate the new customize screen and I notice it put grabage code into my menus, or leave remnants behind of things that I told it to delete and don't show up in the in the customize menu. I avoid the thing and still write it as an mns and then when loading it creates it into a cui, which is a lot cleaner than going through the customize menu. But, to see the contents of the other cuis in the customize screen, I had to open the cuis through the customize screen.