I'm not too keen on spending my hard earned money on gadgets. I bought an inexpensive weighted product called a "Swing Sock" that you can put over the end of an iron. I think it weighs in at about 6 or 8 ounces. It is made of nylon and it just slips over the head of the iron and easily attaches with velcro. Comes off easily and can be stored in your golf bag. It works just as well as the Momentus in my opinion. Or you can go to a hardware store and purchase a 3 or 4 foot length of 1/2" steel bar then slip a golf grip over one end and you now have a cheap golf training aid. My next question is this why not be creative and make your own training aid?