It seems to me that this will make little sense, unless someone runs a service and has dealt with specific brands - and is able to point out their more serious flaws. Because "I've had it for x months/years and it works" answers are, let's assume, hardly a reliable indication of the quality of such a device and its suitability. The list will be of little use, because it evaluates the manufacturer, not the device. For the same reason, the blacklist of power supplies also makes little sense in my opinion as it was created long ago. It was created at a time when low-end power supply tragedy may have actually prevailed and there were a few brands available in our country which, in contrast, made more sense, then it could have been of any use, whereas nowadays, the classification of power supplies only by manufacturer makes no sense anymore, because most manufacturers produce both good/acceptable and poor power supplies.
Going back to the list of UPS manufacturers - in my example, let's take company X. Let's say I have 50 of this brand's UPS under control. 10 of them have died on me. Should I specify the brand right or wrong? Further - I've had models of mainly one series die - does that change the rating of the brand as a whole, or is it still bad because 20% have failed? What about service life? If a 5 year old power supply died, can it be forgiven, or is the manufacturer bad? And the operating conditions? A ventilated rack in an air-conditioned server room might be different from a never-dusted space behind a cabinet under a desk? Could a power supply from which I removed a lint of dust the size of a small animal fail under such conditions, or is the manufacturer bad after all? And what if the battery? After all, that's a fault too. In some models they died after 4-5 years. Power supplies work after it has been replaced. Further, it is worth checking if there are frequent interruptions, blackouts, power spikes, does the power supply mainly get bored? What is its load? A kit drawing 10% of its claimed capacity? Or did someone have it strapped around its max and it was running like that....
Having access to the performance data of 50 units from a single manufacturer - can this be considered any sort of statistically significant figure for our purposes? Even though I won't be assessing them in terms of build quality or solutions used when it comes to electronics, nor will I have any reliable tests, because all I'm doing with them is replacing the AKU or replacing the whole unit?
There are so many and more variables that can result in two completely different subjective assessments of the same product. And here the idea has arisen that a manufacturer should be judged on the basis of probably a few selected models from its portfolio with which it has had dealings.... Exactly how many models for such an evaluation to be authoritative?
And so on....
