If I'm buying a product internationally, especially from China, I don't even consider returns or warranty because it just isn't worth the hassle. It sucks, but that's just the way it is. Chi-fi is a risky endeavor, but there are things you can do to protect yourself.
My advice for chi-fi stuff is to purchase from a usa-based (or wherever you live) business, do not pre-order the product, and wait for user impressions to roll in. Wait for the producer of the product to iron out any early QC issues. If the overall consensus is favorable or if the gripes don't affect you, then go for it. Thing is, researching for stuff like this can take a lot of time, hours even...digging through forums, YouTube reviews, write-ups, measurements, and just thinking about all of this information and connecting the dots.
QC is very important for people buying internationally because if you get a dud and you hear it, you essentially have a paperweight, and sometimes rma just isn't worth the hassle. The cost of shipping the product back, waiting sometimes months for a replacement which may have the same problem or something else wrong is common, been there done that.
It sucks, but that's the dark side of chi-fi that usually goes under the radar. /rant