I just took the survey - pretty harmless. Mostly, it was about the experince I had at my most recent flight physical, and hinted at a quality control survey - to see if AME's are doing what the FAA expects them to be doing. There were a couple of questions that asked for comments relating to the overall need for physicals - that's where you can actually make some meaningful input!
Overall, it appeared to be a reasonable attempt. At a customer satisfaction survey, of sorts.