The only problem I see (if you want to call it that) is that your answers are going to be influenced by folks that have only owned 1 of the choices. If a person always uses RCBS and has never used Redding or Lee, he would obviously vote for RCBS because he has no experience with anything else.
I don't know how you would fix that, though ...... 
Or ....... is that what you are trying to find out?
