Why I switched FROM US vendors TO verified Chinese vendors — what worked for you?

Following on from DebRD_ATL — and this may be the naive question:

How long did you give it before you decided it was working?

DanielChem_CHI said:

One practical note: write down what you did and when, before you need it.

I read this differently from DanielChem_CHI, on substance rather than tone. Not convinced. The evidence being cited is consistent with the conclusion and also consistent with two other conclusions nobody has ruled out.

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

Moderator note: a couple of off-topic posts removed. No action needed from anybody.

DanielChem_CHI said:

One practical note: write down what you did and when, before you need it.

This is exactly what I could not find anywhere else. Printing the relevant bit and taking it with me.

Adding the clinical framing, because it changes how the question reads. The distinction that resolves most of these threads is between what is true on average and what is true for one person. Both are real; they answer different questions and get quoted as if they were the same one.

That is the short version; the long version is somebody else's post.