it is an absolute toss of the dice...
the prices are the cheapest,
shipping costs are practicaly zero, but you may end of waiting months for a delivery,
your purchase can end up being anything from a "exactly as described" to "complete fake"... (test everything you receive quickly),
if there is an issue, aliexpress WILL side with the seller but they will offer a token refund of a 10-30% unless you return the item which is insanely expensive if you try and ship anything TO china (fyi, it will likely be reported as never received if you do return an item)
so, ahhh...
Have fun hehe!!!