Running a flat 5km tonight, first race post 100km. I have absolutely no clue where my fitness is so it could be a good surprise or I could blow up after a mile. Who knows.
I didn't get lapped thankfully so had very little thinking to do. 17:08, I ran faster than that on the road last year, time to get back to speedwork I think.
mine went haywire a few years back and was less reliable than my wrist one. Haven't missed it to be honest, I rarely bother to look at HR.
Used to get the occasional chafing from it too. I never raced in one either, too constrictive.