My wife runs a site concerned with aging, elderthink.com, and she has lots of images on her site. She tried the Getty offer, and here is her experience:
1. The images are served by Getty and reside on Getty servers. Getty can pull the image any time with no warning, leaving an hole where the image had been. For a website with many pages, this could be a serious problem.
2. The images are accompanied by unremovable buttons for the Getty Facebook, Twitter and other similar pages. This would take the user away to Getty-land. Also it seems odd if the image is located anywhere near the website’s own buttons to social media.
3. The images can’t be resized.
4. As a result she has decided to continue buying her images as always. She buys 10-15 images a week on average.
I'm surprised they didn't include fine art and studio photographers, especially given the resolution spec on the D800.