I sent in about six images, some of Holmes, as it looked like they were looking for images. The items it picked out in all images were spot on. What I was a little disappointed in was that it only named the principle features, and seemed to ignore the lesser stars in the field.
However as a result of submitting the images, I've had a huge increase in the number of viewings of pictures on my Flickr page - 839 yesterday, previous high was 93 in one day. At least I assume that its responsible for the increase in traffic, I haven't done anything else recently and my pics really aren't that good to warrant the attention.