New feedback form after you run a session

We have implemented a new feedback form which shows up when you finish testing. We tried to balance two conflicting priorities - 1) not 'bugging' our users and 2) getting feedback we need to make the system better. We made the feedback form short, and, hopefully, easy. We used the ajax star rating system that a lot of sites have been using lately - just click on the 4th star to rate the session a 4 out of 5. There is an optional feedback field where you can type - please, please, please use this if you encounter troubles - knowing what the issues are that people are seeing is half the battle.

We used the Star Rating plugin for jquery to implement this - it is available at http://www.fyneworks.com/jquery/star-rating/ - it was really clean to implement and worked well.