My mother did Slimfast once and succeeded only in making herself very sick...
If you only have 10 lbs to lose, like lovelyivy said, you probably don't have to make any drastic changes to your diet (like Slimfast). Get out and exercise, eat sensibly, avoid simple sugars, drink your water, and more likely than not, that will do the trick.
(says the girl on the Atkins diet
)