i buy from aliexpress all the time, endmills, inserts, tool holders, 3d printer parts, cnc parts, electronic parts, you name it
in total i have been scammed once, and i should have known, the price was to good, and it was a numbered store, 65$ out of probably 5000$
i have no real gripes about the quality, its probably not up to north American mfg. standards, but it works well enough
sometimes i will spend the extra few bucks to get it from amazon if i want it quickly, it is generally the same product anyhow, and sometimes its actually the same price, in wich case i will buy amazon for the ability to return (usually more expensive items, 300$+ kind of things)