Some thoughts:
1. Ideally, manufacturers would not be donors, so as to keep a firewall between site revenue and site reviews. However,
@amirm has been running tests for years now and there is overwhelming evidence of his and the site's integrity via the published measurements and many Not Recommended devices. And the whole time, manufacturers have been permitted to donate and several have. So at this point, making donation a requirement does nothing but even the playing field, which seems to me to be a benefit: if all manufacturers donate then there can be no accusation that donors get better reviews than non-donors.
2. Per
@Urib 's speculation in post #17 above, it appears that has been debunked: Amir will not simply quash a review if a unit measures poorly. If a member sent in the unit, the review will go live as soon as it's done. If the manufacturer sent in the unit, then the review will still go live if the unit simply seems to be a mediocre performer. If the manufacturer sent in the unit and measurements reveal something to be seriously amiss or broken, then he will circle back and offer them the opportunity to fix the issue and send a second unit. I believe on at least a couple of occasions, manufacturers have responded that the unit is performing as designed, and so no 2nd unit has been sent and Amir has simply published the review with the note about his communication with the manufacturer. So he will not censor a review.
3. Per
@Holdt 's comment in post #24, the answer is Yes: if something seems seriously wrong with the measurements or functionality of a unit sent in by the manufacturer, then the membership here will not know about that
temporarily, during the period of time when Amir has reached out to them and is awaiting their response and/or receipt of a second, replacement unit.
I would say it's an unavoidable and totally reasonable scenario, because it would be irresponsible to report the issue to the membership before finding out what is causing the issue. Is it a hardware flaw from poor design or quality control? Is it a fluke, one-off issue that can happen with even the best manufacturers? Is it a software/firmware issue that's easily solved with an update? Is it an issue with a near-final, pre-production unit they sent Amir but they fixed the issue prior to the mass production run (I believe this has happened at least once, but I could be misremembering); is it just how all these units measure and perform?
So yes, if a significant problem arises with a manufacturer-submitted unit, it takes time for Amir to communicate with the manufacturer and sort out what the issue actually is, or isn't. It's not a scandal, an ethical problem, or Amir's fault or responsibility if someone happens to buy that device during that time window. That's called being an adult in a big world filled with lots of products, where information is not always ready at the exact moment you might want it to be.