Carefully compared the old with the new version . Newer smaller sturdy design. Brush has changed shape and is more effective. Bristles are finer and are easily rinsed and dried. My dream is to make this unit the standard BY HAVING AN INTERCHAGEABLE HEAD WITH A DISPOSABLE ONE THAT CAN ATTACH TO THE WELL DESIGNED STICK.. Presoaped. Like the Scott  brush with a great material. Also like how that attaches. Hint.