I actually really like the Beautypedia summary of Arbonne:

Founded in 1975 with the goal of providing skin-care products with "unparalleled quality and effectiveness," Arbonne International is a direct-sales line many of my readers have an intense curiosity about. There must be lots of assertive Arbonne salespeople out there, because no other line with this type of business structure has generated the amount of email we receive, all asking if Arbonne products are worth it and whether or not many of the company's outlandish claims are true. More than many other lines, Arbonne is big on playing up the alleged evil of many benign cosmetic ingredients. Topping this list is mineral oil, which the company maintains interferes with skin functions and delivery systems. Cosmetics-grade mineral oil is not a problem for skin and is in fact one of the mildest and most effective ingredients for making dry skin look and feel better. It doesn't have the best texture or finish, but its effectiveness is indisputable (Sources: Journal of Burn Care Research, May-June 2006, pages 345–351; Contact Dermatitis, June 2003, pages 293–299; Cosmetics & Toiletries, January 2001, page 79; Cosmetic Dermatology, September 2000, pages 44–46; and Dermatitis, September 2004, pages 109–116).

We have also been asked about whether it is true that all mascaras except Arbonne's contain bat excrement. Yes, you read that correctly. It seems many Arbonne salespeople are telling potential customers that all mascaras (except for Arbonne's, of course) contain this substance. We also found that many of the Arbonne representatives we spoke to love sharing the false rumor about lipsticks containing road-kill remnants (except for Arbonne's, of course). We wouldn't mention these tall tales if these were a few isolated incidents, but dozens upon dozens of women have contacted us asking for the truth behind these ludicrous claims. Just to be clear, cosmetic chemists are not venturing into dark caves to collect bat excrement or picking up carcasses of animals on the side of the road all in an effort to save money and create harmful cosmetics. And you have to wonder: If Arbonne products are so wonderfully effective, why do they need to sell themselves using scare tactics about what every other company's products supposedly contain?

Arbonne also advertises the fact that their products don't contain chemical fragrances because of their potential for causing allergic contact dermatitis. We agree with that stance, but it would give Arbonne more credibility if they didn't replace "chemical" fragrances with a slew of irritating plant extracts and volatile oils, several of which are well-known for their potential to cause skin problems. It is their overreliance on such ingredients that makes a disproportionate number of their products impossible to recommend.

we could go on, but to sum it up, despite my reservations, Arbonne has some good products to consider. However, the rather misleading marketing language is not convincing. None of the natural-sounding ingredients in the world can keep you from reacting to an irritating preservative or fragrance, or from breaking out due to cosmetic waxes such as stearic acid or myristyl myristate.