I can only agree with the host of other users and reviewers here about this plugin: top-notch!
Pippin has created an awesome tool for our beloved WordPress and it's becoming more of an ecosystem already.
From my international point of view I can say that Pippin is very much supportive and developer-friendly for the needs of international users, regarding internationalization and such things. He's so open and friendly that it is a pleasure to work with such a developer. All my suggestions for i18n have been approved - I can only say this of few plugin creators that are so open!
The plugin is very much like WordPress itself: modular and ready for customization via Action Hooks & Filters! I really like to work with it.
I also love about EDD that it has minimal style rules applied to the templates/shortcodes etc. This makes it very easy for integrating in every (well-coded) theme/framework.
I like EDD so much that already released three little free add-on plugins for that: maybe with more to come very soon :-)
Verdict: I recommend this plugin to everyone who wants to sell digital goods via WordPress. It makes all things really easy!
--David Decker, deckerweb.de -- WP & Genesis developer from Germany
P.S. With the planned addition of taxes into the plugin it will likely to see much more usage in Europe, so to speak of Germany and other European Union countries. Go, Pippin, go! :)