People get surprised how cheap things really can be when they see aliexpress, and the assumption is crap. I bought a ton of stuff from aliexpress, and very rarely-if any- was crappy.
If it's low voltage then you should be fine. I'd still be wary of large lithium ion batteries, though.
I probably would hesitate to buy large-battery-powered things from them, for now. Like e-bike etc. Also would hesitate to replace my circuit breakers with zigbee circuit breakers that can also measure power real time, for example.
But there are a lot of good quality stuff that doesn't fit into the dangerous category.
I bought a lot of sensors/smart home stuff, small home stuff like drip irrigation tubes/drip heads, apple find-my compatible trackers, poe cameras, 80x80 fans, label maker tape, poe extender etc.
All numbers spit-balled.
Took a week or so to arrive, and prices fluctuate all the time. So slower than Amazon shipping - which is usually same or next day.
I bought a lot of 5-10$ things that costs more than 3 times on amazon.
Aliexpress is much cheaper even if you include shipping if there's separate shipping fee.
Amazon is convenient for speed + returns.