As long as the plugin cannot link to a custom url I don't see why anyone would want to use it, but looking through the code I think everybody should at least download the plugin to see how well it has been put together!

The only thing I don't like is the sentence about and link to premium support. How am I supposed to use this on sites for clients?

I'm with Marty, using Image Widget, which is not WPML compatible, but that is something I can easily work around :)