Great idea.
One suggestion: This survey seems to be for people who use modafinil regularly. I might suggest doing something (perhaps creating another survey) to get opinions from people who tried modafinil once or twice and disliked it. My one experience with Nuvigil was quite bad, and I recall Vaniver saying that he thought modafinil did nothing at all for him.
The survey could have multiple pages:
The first page simply asks:
What's your modafinil usage:
a) Never
b) I used it in the past and then stopped.
c) I'm currently using it. (leading the user to your current survey)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.