I've been using chains from Aliexpress for >3yrs now, my take is that you need to be more aware of the store, if it seems legit, than of the reviews (because more often then not it's just a '1st impression', not a proper review)
gone by 4 KMC x10 chains and all seemed legit, lasted around 8kkm so good enough considering all were bought on sale
I'm on my first YBN set and I'm liking it, apart from one time that a link disengaged and I had to fix it on the road, nothing to complain.
I've seen YBN on 'Choice' items, so I think it's worth taking a look, considering the low price it should be enough to try it at least.
for the 11.11 sale in general, prices didn't drop much but that's usual for AliEx for at least 2yrs. But for Brazil at least the coupons this time are very good, and plus the progressive discount, it's the best sale in a long time!
I've got
this 3D saddle from Ryet to try out (have the Aircode one and love it) and also
these VXW gloves to replace my YKYW ones.. also some Hualong bottle cages and other small stuff for my mtb. I'm trying to keep it cheap this time, not much money extra right now lol