Starfall has a great system for capturing the VOC
My 3 yr old D. loves learning on Starfall.
Starfall is a free online service that helps your child learn and read using phonics.
I enjoy watching her play but what caught my eye was how they got customer feedback from her.
After every lesson a quick survey is taken (see video below) where she can voice if she liked the program or not.
Next time someone tells me "It's hard to get customer feedback", I'm going to point them to Starfall showing that even a 3 yr old can do it.