Post-Commission Survey?

[graffitistryx.livejournal.com]

Hello, a_b!

I have begun taking commissions more regularly lately, and I was considering requesting that my commissioners fill out an optional, public post-commission survey after I complete their orders. I intend to use the survey as a means to judge my progress and improve my craft, in addition to providing references for future commissioners to assess me by, but I've got a few questions:

• For those of you that use, or have used, a post-commission survey, have you found it to be beneficial or is it generally not worth the hassle?
• What questions should I ask, in general?
• Are there better alternatives to LiveJournal for hosting the survey, while still allowing anonymous contributions?

Thanks,
- Avisk