I buy like once a week on Aliexpress:
Save: Seller only get the money after delivery, and if something broken, does not work from the beginning Aliexpress is helpful.
Had several complains and always got some fair refund without shipping back.
Latter warranty: Forget it.
Lots of excellent products but also lot of crap...Fake SSDs are famous, fake electronic chips, but real good and honest things.
Most small things come without paying import duty.
Bigger things like bicycle frame and wheels I paid import duty. Note that 10% import duty is you paying about 30%.
Some do "special line" which means no customs.
I can only recommend it for small items....I would think twice (or more) before buying some thousands of Dollar item there.