It's 6 months that I use my Forerunner 235 and I thing that it's good product, but have some problems.
Then temperature go down (in winter I run outdoor until 2-4°C...) system for read HD go bad: usually I run after some minutes around 165-175 bpm, but Forerunner have more difficults to go up 140 bpm with more steps up and down false and without sense (my heart don't go down and up for 10 bpm without any sense...). It's not problem about belt large or about bad position, because when there is normal temperatur (more that 8-10°C) in the same condictions it read well and constant (difference around 2-3 bpm that is ok...). For me Garmin must change firmware for more strong light emitter when temperature go down because I'm sure that problem is that there is less blood in the arms then become cool: maybe is possibile do it automatic or put a possibility to choose an option in the configuration of watch. Better less buttery but good bpm than opposite...
Second question about bluetooth: it happend too much time that there is not communications without sense. Is not problem that I have smartwatch too much far from Forerunner or with bluetooth turn off or any over problem: simply Forerunner stop to communicate and I must turn off and on bluetooth on smartwatch and/or more usually on watch. Please solve it finally...
Another question about distance: why I haven't a graph about total distance (not only about activity) in a week or in a month? I must sign distances on an Excel table for have it and I think that it's very idiot.