I've been using Figure 8 for a couple of weeks, and I feel NO HUNGER whatsoever afterward. Of course, I blend mine with 1 cup OJ, 8-12 strawberries, and 1 banana. Oh, and some ice cubes. Strawberries contain pectin, which makes you feel fuller longer (one study showed that participants who drank OJ fortified with pectin stayed full up to FOUR HOURS longer than those who just drank OJ). So, whether it's the strawberries or not, I'm finding that I can go an extra 1 to 1 1/2 hours longer before having to eat lunch...and even then, I'm not starving like I used to pre-Figure 8.
I can't use whey. I have lots of problems with it. It just wreaks havoc on my digestive system. That's too bad, because it comes in so many flavors now and is so good for the body!