The amount and quality of the work that SustainUS produces is quite high, particularly since it is largely a volunteer led organization. I've had the opportunity to talk with previously engaged individuals and they uniformly provide clear examples of how their engagement with SustainUS helped clarify or enhance future professional goals. SustainUS's efforts have also been helpful with give capacity to groups around the globe.
One area where SustainUS is working on, and needs further institutionalization, is capturing what it acheives.