Rahul Vohra [Archive.org URL]

[Sean] Ellis [has] found a leading [product/market fit] indicator: just ask users “how would you feel if you could no longer use the product?” and measure the percent who answer “very disappointed.” After benchmarking nearly a hundred startups with his customer development survey, Ellis found that the magic number was 40%. Companies that struggled to find growth almost always had less than 40% of users respond “very disappointed,” whereas companies with strong traction almost always exceeded that threshold.