Full Bars...do they really work?

Yesterday at Walmart I ran into some Full Bars. I've seen the cheesy commercial so many times and decided to try it. I ate a bar, the cocoa flavor and it was pretty good actually. It tasted like rice cake/cereal. Then I downed some water and waited a few minutes and I was pretty full already. I then started to eat my lunch and I couldn't finish it. I picked at it. I should eat those before my biggest meals. A box of 6 costs about $7 and some change. I'll try it and see how it goes.