We did the same thing at reddit when we upgraded the search system. First we put a little survey on every search result that said "Are you satisfied with these results? yes/no". After we collected enough data, we changed the entire search backend out, but told no one. After a few months of collecting data showing the satisfaction go from ~70% to ~90%, we made a blog post explaining what we did. Here's the real kicker…
Make no mistake about it, this is clearly a marketing ploy by Kraft's ad agency. They are battling the minds of consumers who are (as of recent) continually seeing companies change ingredients and then be marketed to because it's "preservatives are bad...now with less preservatives!", with an undesirable side effect of "hmmm, but it tastes different". Coke Zero is a great example of this effect. I'm not so sure Reddi…
Ad agencies doing marketing? Those bastards!