I’ve been using HRV4 for several years and while it’s not 100%, mostly user based errors, it’s been good enough. I was on the fence for months about Whoop and then DCrainmaker tipped me in the No direction…
…”the sensor simply isn’t all that accurate when you sit down and compare it second by second to other products on the market. And given it’s the only input into Whoop, thus the only input into the Whoop platform is the data coming off that sensor, it becomes a real issue…”
I’m interested to hear counter opinion