While this plugin appears to work for 3.2.1, it was not obvious when first implemented.
Our RSS feed for our WordPress site was set to update hourly and as a result, it didn't immediately show the new image media that was being linked in the feed. This isn't the plugin's fault, of course, but it's still something to keep in mind when setting this up for the first time.
One problem I did find with the plugin was with its "Select the size of the images" options on the plugin's settings (Thumbnail, Medium Size, Full Size).
These don't line up with the options in Media settings (Thumbnail size, Medium size, Large size) nor the Gallery settings when editing a post (Thumbnail, Medium, Large, Full Size). On the plugin page, it says, "You can change the dimension of this sizes under Settings/ Media." Then why is it that the Large size is missing? This is very confusing and I'm still a bit unsure of how these settings are being fed.
It's also unclear how exactly this is working with images that are uploaded through the Gallery and dynamically generated to the size dimensions specified in Media.