You will probably like http://fakespot.com/ for discovering those fake reviews. ;)

Unfortunately it does not always work accurately, but I think it gives a good estimation whether a product is legit.

Example for AmazonBasic: http://fakespot.com/product/amazonbasics-mid-back-mesh-chair

And for "Engineered Now": http://fakespot.com/product/headrest-for-herman-miller-aeron...