Here's the question I ask of you.
If you start using shakes, and you lose weight... what do you do when you stop drinking shakes?
The problem with shakes and such isn't that they don't work (they're a legitimate means of cutting calories to lose weight) its that they don't teach you how to handle the cause of your weight gain: overeating.Most people who do short-term diets and shakes end up gaining the weight back and then some because they never addressed the root of the problem.
Shakes don't teach you how to deal with a buffet, or a surprise plate of cookies at work, or how to negotiate a restaurant menu.
Skip the short-term fixes, and focus on building a healthy lifestyle you can keep up for a lifetime.