Assuming the device provides accurate data, I think many QSers would be interested in using such a device to conduct short-term experiments/monitoring, but getting a generally healthy person to wear a dedicated BP device 24/7 long term might be a hard sell.
I currently use a Withings blood pressure monitor for periodic BP measurements, but there are a number of single-reading devices coming to market that provide quick readings (by touching to the forehead, etc.) such as the Scanadu Scout (which I've had the chance to try out).
Another requirement is access to the data (either via an API or simple data export). Good luck!