I'm a speak your mind kinda person. I feel they are paying me to do a job and they should be entitled to candid feedback. So, I've always filled out the survey with honesty, but thoughtful honest...maybe making sure I "cushion" the negatives with positives.
I'll tell you, last year, I wrote something that was supposed to be a compliment about my manager but I found out it wasn't taken as such. On a field visit, he started talking to me about the survey and how people wrote some not so great comments and he then read a line from their review....and it was the line that I wrote. GULP. Check mate.
There are 11 people on the team, I doubt it was dumb luck that he asked me about it. Weird. I'm learning honesty is not the best policy. I tend to finally agree that the managers know who writes what.
PS. I've found if you rate your manager a 4, and they other team rate theirs a 5, then the manager gets mad, and just finds more classes on learning network for us to take. Pointless.