We're building a headband which monitors your sleep state, and uses different types of auditory stimulation to improve your sleep.When we're talking to people about what we're making, we're getting great feedback, and often hearing "when you're ready for a test users, let me know".I'm taking this as a positive sign that people are interested, but not sure if anybody else has the experience of people asking to be "test users" rather than just saying "I'll be your first customer"?When pushed directly on the subject, the response I get leads down to the conversation around efficacy & pricing, which is great, but I'm wondering if anybody else has had a similar experience and can share what they learned?I've just started reading "The Mom Test", so taking some tips from that too, but maybe haven't gotten to the part yet which might answer this question.For reference, our company is 