As someone who's (afaik) the highest customer tier on Aliexpress, based in europe, i've just returned almost 10 items, about half of what i bought. Super easy process, and free. Very different from how it was years ago.
So, I'd say, don't shy away from ordering something, as soon as you receive it, test the hell out of it because you have only about 15 days to complain efficiently, and voila.