No good reason for that but based on the DCR review of the Fenix3HR here http://www.dcrainmaker.com/2016/02/garmin-fenix3hr-review.html the sensor seems to perform a lot better than on my FR235 (and DCRs FR235 review unit) especially for intervals where it almost never "follows" the actual HR during the recovery sections. Now he does say that he reviewed the FR235 several months ago, more like a couple I think, but what he'd found in his review of the FR235 still stands on my FR235.
So does it come down to the shape of the watch (larger footprint), tweaks to the hardware, tweaks to the software not yet implemented on the FR235 (I wouldn't put that past Garmin...) ? Anyone else here used both and seen the same improvements ?
