Me and my partner went from tacx blue motions to kickr cores… that was a wake up call! We both lost about 10% from our ftp overnight 
I’ve hit the number and more legit now, so overall it was probably a good thing
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I feel like I won the lottery. I’ve used a Saris Magnus M2, 4iii left, Saris H3, and Rival Quarq left side PM. Did analysis across all powermeters and honestly doesn’t make a difference which I use.
4III read about 2% higher than the H3 on any duration from 1-20 minutes. Rival Quarq and H3 are identical (table below is H3 vs Quarq). Putting a 2% offset on the 4iii made it irrelevant which powermeter I use.
| 15 Seconds | [333 watts] | [332 watts](-0.3%) | ||
|---|---|---|---|---|
| 30 Seconds | [329 watts] | [329 watts](0%) | ||
| 1 Minute | [319 watts] | [322 watts](+0.93%) | ||
| 5 Minutes | [209 watts] | [207 watts](-0.97%) | ||
| 10 Minutes | [192 watts] | [191 watts](-0.52%) | ||
| 20 Minutes | [177 watts] | [177 watts](0%) |