Many people look at the reviews of the individual product, which is obviously important, but overlook the reviews of the seller.

I did my first hydraulic disc build last month, chewed up a shifter bleed screw in the learning process. Ordered one from a seller with ~75% positive feedback (without checking first) and still haven’t received my part. Ordered one a few days later from a shop with 98% feedback, arrived in 2 days.

Amazon is no different than anywhere else. Informed consumers make smart buying decisions.