Been using the Whoop for a couple months now. Two issues I noticed: (1) the bands are not very durable and come off after a couple weeks. I also stopped wearing the Whoop under the shower to mitigate against the band quality problems. (2) Whoop gets terribly confused when traveling. During a recent trip from my base Hong Kong to San Francisco it showed sleep as naps and naps as sleep despite me having sycned it a couple times to my iPhone which had the correct local time zone.