I used this site with pre-service teachers, who designed a lesson using it. Their fellow students then completed the lesson and evaluated their experience with the site.
My teaching methods students found favorable results with the site. All the students who completed the work involved in the lesson found the site usable and educational. Overall, the site was given very high marks, and those who designed the lesson said they would return to the site again. Thank you.
The common complaint revolved around the videos of star formation, with mention of the lack of a start and stop button, a restart button, and audio. Otherwise, good marks.