Pieppiper, there is only ONE absolute measure of speed stability (ie the correct speed, the exact time it takes to go from a to b), and that is only correctly measured at the platter, and that is errors per million measurements. No rocket science degree required here. No other turntable measures speed accuracy at the platter level, so any claim to a speed accuracy figure is nul-and-void because its unverifiable. Now, when the GPA Monaco claims a maximum of 2 speed errors per 1 million measurements it means appr. 20 mintes of vinyl playback can be played without errors as Roy Gregory explained. It would be interesting to measure all other top tables out there with the same technology, I'll bet ya, they'd all fare miserably against the Monaco due to their older, lower performing technologies. And how does this best of speed stabilities express itself? Well in the most accurate and truest playback through the entire - yes entire - audio bandwidth as it was recorded and transferred to the vinyl disc. That is not coloration due to the Monaco. Coloration comes from all the other attached equipment, and resonances that impacts measurable speed stability. IMO therefore the Monaco is the MOST admirable attempt to date and audibly so.
I agree with you that this measurable technological superiority is indeed a starting point, for Grand Prix Audio turntable design and hopefully all tt designers, imagine the improvements on this table GPA have in store! The rest of the comptetition better start waking up to a new champ, you know what they say about betting on old horses... shake up old paradigms!