I have tried the new ERG mode Power Matching feature, where I set my Stages (Dura Ace) as the powermeter, and the Tacx Vortex Smart as the controllable trainer. Cadance is also measured through the Stages.
Somehow the ERG mode is not consistent at all. It does from 20/30W over to 20/30W under, almost never on target. Feel the resistance of the smart trainer change all the time.
A completely different experience compared to using the smart trainer as power meter.
Hope this ‘issue’ can be fixed?