As with anything (tech or otherwise) we buy these days, it's warranty and model obselescense) ... if someone warranties it for 2-, 3-yrs, or more, the quality is probably in there. I've seen warranty's drop to the 1-yr level, and some (many?) as low as 90- to 30-days.
If that isn't an obvious *don't use OUR device* red flag, I'm not sure what is ...
It isn't that flash is in everything, it's the warranty that they put on it or anything ... some are jokes, some imply real seriousness about quality (for the most part).
Next up is the intangibles behind the product ... here you have to dig into their website "support" pages, and see if they actually produce firmware updates, have healthy-looking support pages/articles, etc.
Finally, if you got this far with a prospective tech purchase, it's forum detective work ... what are others saying about it?
I couldn't buy a tech device with a 1-yr, or 90-day, or less warranty, without considering it "disposable", and planning accordingly.