SupplementWatch has reviewed the product....I think it received a decent score....
http://www.supplementwatch.com/reviews/subcategory.asp?subcategoryId=15&reviewcategoryId=8
Soy is an excellent protein, given its other benefits of heart health, etc.. A good place to do research on supplement ingredients is www.supplementwatch.com
They also do product reviews..I think Genisoy got a top ranking from them for protein mixes.
Supplements are regulated under DSHEA, but products are not checked for ingredient amts or quality...there are some companies and universities doing this, however. www.consumerlabs.com is one and www.supplementwatch.com uses a different approach - ranking products based on claims, efficacy...