How specific events throughout the day affect your BP, like things you ate, caffeine, a walk in the cold/heat, exercise, or a conversation. I'd say it's all useful info for perspective on how to manage stress and circulatory health.

I can see how the information can be useful from a big-data perspective (finding correlations between the data of thousands of people), but for individuals I'm not convinced yet. For example, how do you know if a spike in BP is normal, or if it's only happening in your specific case and it needs attention?

I think the best answer to that is ask your doctor if you see something that concerns you. Though, even without an expert opinion or big data as a reference, establishing what is a baseline for yourself and then noting when there is significant deviation can have value. It could be an early warning sign or just encouragement to get help if your BP is one day very high or low. Some googling can probably give you an idea of what are normal ranges based on activity, too.

One real answer is "we don't know because this capability hasn't existed before" I mean, you can wear something like a traditional cuff that puffs itself up every five minutes or whatever, but that doesn't really fit into a patient/subjects life. Good like trying to recruit people for a long term longitudinal study.

But having worked in medical sensors, and spending time with researchers as customers, there was a real sense that they could learn a lot from BP readings that were accurate and continuous.