Vendor customer service ratings — looking for input

Dr.SportsMedIN said:

The distinction that resolves most of these threads is between what is true on average and what is true for one person.

That is correct as far as it goes, and here is where it stops going. Yes, and the corollary is less popular: if the reasoning holds, it also holds where it produces an answer we do not like.

I would rather be corrected than agreed with, if it comes to it.

AmyNC_wife said:

Right, and one flattering data point from a group buy is not consistency.

Saving this. It is the first explanation that did not require me to already understand it. Taking it to my next appointment.

Dr.SportsMedIN said:

The distinction that resolves most of these threads is between what is true on average and what is true for one person.

Pushing back on Dr.SportsMedIN here. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.

If somebody has the primary source to hand I would rather cite it than paraphrase it.

Adding the numbers, since they settle part of this. For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine. Half the figures circulating in this community trace back to a secondary summary that dropped a qualifier.

Moderator note: a post naming a supplier has been edited. Discuss suppliers in the review sections, not here.