Today was my first run with the FR955 and I have to admit I was impressed with the OHR. Basically since optical HR monitors started appearing in running watches I have not been able to use them due to the cadence lock issue. Since the FR235 I've had a Fenix3HR, FR935 and a Fenix5+ and all of them, without fail, would tell me I'm having a heart attack after just a few kms into a slow jog. I always assumed I had the wrong skin type and gave up on them and stuck to chest straps. Today I ran a 10k and the optical HR data was solid and reliable with no chest strap paired. It reacted as expected when running uphill and my HR settled again on the downhills. At a steady cadence of ~180spm on the flats it was where it should be. All in all I'm very happy with it so far. Yes, there are problems with maps that cause reboots but once those issues are ironed out it should be a solid watch.