Doesn't help you at all when the company waits until the review is done (possibly speeding it up by soliciting independent reviews early), and then swaps out the components and manufacturing process for cheaper, worse one, without changing the product name and the SKU. Big brands have already been caught red-handed doing it; most recent big story I recall was about hard drives.
Or the automotive way, giving reviewers a full vacation in Tahiti with all things included that happens to include a test drive of their new car somewhere, making sure they're ahem all relaxed so they can give a completely fair and unbiased review.
