I have not tried it.
I wonder whether they would be free for retired people doing pro bono work.
One thing to watch out for. I have received several surveys recently that put high scores (excellent, best, most ____, strongly agree, etc.) on the LEFT side of the page/screen!
Suggest that the designers were not aware of trying to associate visual stimuli with the number line. Reminds me of people who cannot understand why one would use a zero as the stimulus for none or almost none, never or almost never, etc.
Art Kendall
Social Research Consultants