My Tacx Vortex was horrible - like 30-75 watts off depending on how warmed up it was and depending on the intensity level. I did a lot of testing to figure it out.
What I’ve never understood is how dual power meter pedals can be accurate for measuring dual sided power. Do the companies especially calibrate pairs of pedals so that they are spot on?
Power meter pedals may be a convenient solution for many but I think the gold standard is probably crank based (quark, power2max, etc).