I just took one and this was my message at the conclusion:

Congratulations!

You have successfully completed this survey, and a sweepstakes entry will be credited to your account.If a cash incentive was also offered for this survey it will be credited to your account upon project closure.
Thank you for taking the time to share your thoughts and opinions.

It was about Indiana colleges. I didn't get taken back to the Congrats page so I tried to take one again and was able to (even though I didn't qualify). Guess it didn't count, but maybe tomorrow will surprise me.