Some of the reviews aren't so glowing, Edward.
And I've only been checking it for a couple of weeks - since I was alerted to it through another thread here where many of the same suggestions were made (let us know, make it easier to find, etc.). I now check it daily. It has been my limited experience that images are not random. And since there aren't that many buyers who come back after they have received the product and post a review, you can easily keep up if you do so. Probably every 4-5 days would do it, but it's easier for me to keep track if I do it daily.
For those who missed the earlier thread(s) or who just don't know where to find the reviews, it's under About > Satisfaction Guarantee > #4.