The Sean Ellis Survey: When It Works, When It Misleads, and What To Use Instead

The 40% 'very disappointed' benchmark came out of Sean Ellis's work with Dropbox, Eventbrite, and LogMeIn — consumer and prosumer products with short feedback loops, surveyed in 2009. Applied without modification to European enterprise B2B today, to developer infrastructure with free tiers, or to hardware with regulatory approval timelines, it produces results that range from approximate to useless. The survey works when users are also buyers, feedback cycles are under 30 days, and you can survey 40-plus active users without an incentive. When any of those conditions fail, you need a different methodology. The right PMF metric is always a behavioural experiment — not an attitudinal survey. What replaces Ellis varies by category. Here's how to choose.