NPS is a well known metric for understanding customer sentiment of a product of service. It's industry standard for VCs and other investors.
Whats really valuable though is knowing WHY someone is a detractor, or a promotor, and importantly, what you need to change about your product to move the needle.
As a PM for 15 years I'm always looking for ways to get unbiased, genuine feedback from customers. I built Sensaro to help with this. It's a simple tool to collect NPS scores, and then analyse the data to uncover key insights, opportunites and intellence by segment (detractors, passives and promoters), so teams can work on the most valuable things.