Any review should be what you think of the product. State what you thought was a benefit, what did and didn't work and if you would recommend someone buy the product. Include pictures and information from the products website. Make the post a decent length, short review post are pointless and not helpful to a reader. I usually make mine around 200-400 words depending on the product and the site the review is going on.
Features, Benefits, in an easy to read format (bullets, check point). Also, with any review, spend less time describing the product and more time discussing the results (or lack of results) from actually using the products.