Hmm I wouldn't try them, as they're quite pricey. There are cheaper ways of stopping appetite and hunger pangs:
1) Getting protein and complex carbs each meal - studies have shown protein may actually block the signal which the stomach sends to the brain to say its still hungry (I can actually vouch for this, though I don't know if its psychological or actually true).
2) drink upto 5 cups of green tea a day
3)obviously get your 2lt. of water a day
4)complex starchy carbohydrates as a snack: I love to have a banana, spread with peanut butter and topped with cinnamon - fills me up for a few hours and all that for just over 200cals.
5)Studies have shown cinnamon may also be beneficial in stopping hunger pangs and helping to surpress appetite - again I can vouch for this. Cinnamon is never out of my spice rack now.
Those are just a few ways you can help surpress your appetite - none of which are more than a couple of pounds =). I tend to be wary of diet pills/sachets or anything like that; very few of them actually work and most are just expensive combinations of ingredients you can find in a supermarket for a fraction of the price.