I treat all advertisements as if they were false.
Especially those advertisements with lots of small print, weird fonts, and otherwise unreadable caveats. And vanish fast when displayed.
Likewise for fast talking, use of celebrities, or other potentially misleading images. Like not showing cords, making problems appear worse or more complicated than they really are, etc., etc.. Using the FUD factor (Fear, Uncertainty, Doubt).
Statistics or statistical claims are another caution point.
"Compatible with", "fits all", "universal", "lifetime", etc., all being immediate warning flag words to me.
Something may indeed work but for how long and how well - that is a different matter.
Lack of details regarding basic information. Creation of new terms and acronyms. Maybe just basic specs or no specs at all.
Generally learn more about the product realities via User Guides/Manuals and some reviews. Sometimes Forums and FAQs help.
Pay attention to what is not said versus what is being said. Be very skeptical and cynical. Apply common sense.
However, unfortunately, the truth may still not be known until you make a purchase and have the product in hand.
Prerequisite: Check into the return/RMA policies. Which can be equally vague and misleading....
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Maybe move this thread to Experiences and Opinions..... ?