I had a great experience with original Zeo, at least as far as I can tell timing and correlation-with-next-day wise. Unfortunately, they went out of business an

I had a great experience with original Zeo, at least as far as I can tell timing and correlation-with-next-day wise. Unfortunately, they went out of business and the headband battery is not (easily?) replaceable, so once that ran out it became a fancy alarm clock. I would be interested to know in particular if all the gimmicky trackers these days even remotely approach Zeo in accuracy; I know for sure that, for me, the "put your phone in bed" ones don't.