I found this site very helpful. I spent approximately 1 hour (shorter if on T3 line) setting up a four-question survey for one of my courses. The students found it easy to respond. The quality of the data obtained is, or course, related to the quality of the survey questions generated. That being said, the ANONYMOUS information that is generated is very valuable. I would encourage others to set up the survey so that students can see what others have said.
Finding a course is more difficult than it needs to be. It is supposed to be alphabetical, but that isn't apparent. Finding by instructor is even more time-consuming if your last name begins with a letter near the end of the alphabet. A search function would help useability greatly.