We believe in A/B testing all ideas. Whether the idea is based upon a feature in an app or website or a marketing campaign message. We strive to work out what is the best metric to judge the test upon. This can be challenging to avoid vanity metrics. We build a product that the customer wants, not what we want. It is embedded into every part of the process for us. We strive for gains that have the biggest impact, but do not discount a gain no matter how small, as they all add up.