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Sources & notes
Rahul Vohra published Superhuman’s four-question survey, based on Sean Ellis’s method. Fillo keeps the disappointment question and rewrites the three follow-ups.
Survey recent users. Superhuman selected people who had used the product at least twice in the previous two weeks.
Read the follow-ups by disappointment segment. The 40% “very disappointed” threshold is a practitioner rule of thumb, not statistical proof of product–market fit. Keep eligibility rules consistent when comparing results.