Well, to be honest I was at time new to power based training. Before getting the xcadey crank I had a tacx flux smart trainer and I was just riding on zwift. I never cared about calibration or spin downs until I got my vector 3s. It took me a while to realize that power numbers can be inflated or deflated over time so calibration is necessary.
I remember almost 2 years ago when I was riding on zwift with xcadey as my power source and I noticed that my power readings were 20-30W higher than what it used to be. I just didn’t care about it as I didn’t want to get serious with my training. Now with my vector 3s I make sure to calibrate before starting every ride and make sure the torque is close to 0.0 which removes any residual torque.
One more important thing I forgot to tell you. I had a difficult time interacting with their support team due to their limited English proficiency(they are based in China).