Hi
I really like that I can calibrate the overall distance, but when I do an inclined workout the uncalibrated lap paces then deviate substantially from the treadmill lap pace and it I don't like having wildly incorrect data in my activity file. Surely it can't be that hard to normalize the pace log to a calibration coeeficient and then derive the lap paces from that. They might not be exact, but they'll be pretty close.
I know Garmin Support states that laps won't be calibrated, but seriously if Coros are able to calibrate the treadmill laps then I might be tempted to switch, just sayin.