I can't comment on that specific product, but I CAN tell you, based on all my professional experience, that there is no way you can get all the nutrients you need through diet anymore. Not without eating 5000 calories a day, and we know what will happen if we do that! Even if you cut out the processed foods and stick with whole foods, by and large, they just aren't grown in complete soils anymore. The American Medical Association published a recommendation in 2002 that you need to supplement just to get nutrients - and remember that the RDIs on most supplements are bare minimums, not optimal levels.
If you're told you can "eat healthy" and get all your nutrients, you're hearing advice from 20 years ago that's been tossed out by all the current medical and nutritional science. It's what we want to believe, but it's not true - and it's evident from our increasing weight and increasing health problems. Whole wheat, for example - sounds good, but it's not the 5 foot tall wheat plant of 40 years ago. Even if it's organic, it's grown quickly to a foot in height, and in soils missing key nutrients. So we're starving for optimal levels, we're eating more and more to try to find those nutrients, and we're still heavy and still sick. Health rates are declining, and 2 out of 3 of us will contract non-communicable, chronic degenerative diseases (cancer, heart disease, diabetes).
So jumpstarting your metabolism is a worthy goal, but it's just not enough. You also have to be sure it doesn't do that by stimulating the central nervous system, which is what caffeine does, for example. It's not a healthy or sustainable mechanism, and as fast as your metabolism goes (even if done in a healthy way), if your body is lacking nutrients because they aren't present in your food/shakes or if they aren't fully absorbable at the cellular level, the body's going to a) slow down because it thinks it's starving and b) develop inflammation (the prime cause of disease).
To evaluate any product, I'd look at what ways you have to ensure that what's on the label is in the product. If that product is made in a lot of other countries (and sometimes even here), you have no guarantee. If there's a US government patent particularly on a food product, that's extremely unique and worthy of note. (That doesn't mean a patent on just one ingredient, but on the entire formula.) Then you want to make sure that the company selling it is more than 5 years old (10 is better - you want to see a track record and know if there's been legal action or recalls), that it has the FDA's Good Manufacturing Practices designation, has a Chief Scientific Officer rated highly by Exec Rank or other neutral group, and that it is a member of the Direct Selling Association (a watchdog, invitation-only group).
There's nothing wrong with your friend making money - why not her? Why should the only money be made by GNC or WalMart selling stuff off their shelves, when they have far more layers and levels than any MLM company. You just want a GOOD MLM company, just like you want a good corporate company (which is why many people will buy from, say, Costco but not WalMart if they disagree with corporate ethics or failure to pay living wages). So it's not the structure of the company - it's the integrity. Economic experts like Robert Kiyosaki and Suze Orman endorse direct sales (MLM) - but only the good ones that pay people fairly and don't make outrageous claims.
The question is, in addition to what I wrote above, can your friend demonstrate safety, effectiveness and uniqueness of her product? Can she provide clinical data? I have seen nothing on this product. Are they making unsubstantiated claims? Again, it's not the direct selling company per se that is the problem - Dannon Activia and Airborne had to change all their ads because they made health claims that couldn't be supported, and Chobani got in trouble for not disclosing that they use GMO products. So their sales dipped. And their prices are jacked up to pay all that advertising, commercials, celebrity endorsers, and so on.
Yes, we need nutrition, water, rest, and activity. But it's not enough. And you should not be taking a nutritional product short term, assuming that your food will be enough later on. It's not. You need to nourish your body properly all the time, and there's no debate anymore about whether that involves supplementation.