Hi Andrew,
The description clearly stated that application disigned for image effects and not color filters. But it doesn't help. The last user complained that application doesn't have color filter. I personally out of ideas how else I can clarify what application is and what it is not. May be suggest users to pass IQ test before purchase (something tells me that type of app description won't pass QA).
By black-box like content or app I meant situation when there is just paid version of app and support web-page do not give much info about app. So user basically have to buy app to discover what it can do and how it work
is it possible that user asks money back if he doesn't like app but his comment remains published? is it possible to do it by developer's request, cancel purchase and remove comment? Thanks