Alibaba is just a distribution company for many a seller.
Some sellers are good some sellers are bad.
Equipment is all over the place for quilty, some good some bad.
Sometimes they never ship at all.
I have heard many a horror story about long delays, Non shipments, and over all bad quality.
And even though they say they have a good return policy, it's rather inconvenient most of the time.
Also note that 99% of the time this is not a direct delivered item, you will have to get a freight forwarder or go to the port to pick it up.
And even if everything goes to plan and you get it, replacement parts support and availability of parts will be non existent.
Most equate purchasing something from there like this as a throw away item, when it breaks you throw it away.