As an appetite suppressant, they didn't work very well, for me. The diet regimens were generally the equivalent of a glass of benefiber/water before every meal and once in the evening. Oh sure, they suppressed my appetite, but they also caused such severe abdominal cramping, gas and diarrhea that I had to practically live in my bathroom.
In the winter, I sometimes use fiber as a supplement, but in the summer I don't have any problem getting my fiber from produce (and I'll have the same bathroom issues if I don't add them in gradually).
That's the most important thing when adding in fiber - whether it's from produce or supplements - increase gradually. Sudden fiber increases (or decreases, for that matter) can cause painful digestive problems. And if you're at all prone to digestive issues, they can be "wish for death" painful.
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