I originally bought mine for treadmill Zwifting and found it to read consistently low by ~40sec/mi (both on multiple treadmills at the gym, and wrt HR and perceived effort). I also found running on Zwift to be a fairly unengaging experience (compared to biking).
That being said, I LOVE my Stryd for outdoor running. It helps to have accurate real time pace (the Garmin GPS is all over the place and useless for this), and the power reading helps me to not overcook things on the hills (HR has a bit of a lag, so is less useful).
so much ditto to this post.
i wanted to use the stryd for treadmill runs but its so far off what the threadmill reads, and stryd says that its suppose to be because they are THAT much more accurate than treadmills. oh... you mean the $12k woodways that i run on? i think not.
if its off on the treadmill it makes me really question its accuracy outside, but as far as pacing i completely agree that i much prefer using the stryd pace over my 935's gps pace that lags, slow, screws up if its cloudy.
its found a very indispensable niche in my running, but probably not what the creators designed it for primarily.
'21 Captex Tri / Lubbock 70.3 / IM Cozumel