We used Vitrue for a Facebook in-wall app to run a social media promotion for a client. Overall, it did well and got the job done with a pretty quick turnaround time. It's a fairly straightforward plug and play solution for very basic promotional needs.
We were able to easily and quickly manage our promotion within the platform. Uploading images and text was a very intuitive process.
We had a few minor issues with changing some of the Vitrue pre-loaded text. Some of the grammar was off and it wasn't something we were able to go in and change ourselves. We put in a ticket to get it fixed but it took a couple of weeks to get it rectified. This was a real problem.
Overall, we were satisfied with Vitrue for our basic promotions. We have yet to try it for a more complex campaign, so I'd be interested to see how the user experience will be with something that requires a lot more content.