Does Anyone have a Quantum Scale?

 Okay so I just stumbled on a link to something called a Quantum Scale and it sounds pretty cool but I'm not 100% sold on it. I was wondering if anyone else had one? If so would you recommend it?

For those who don't have it, it is a scale that never shows you your weight and only shows you how much you lose or gain. I'm not sure that I can deal with not being able to see the number on the scale. It will never ever show my weight which might be frustrating to me.