I bought an alternator from rockauto back in March of 2018, installed it, and my car broke down on the side of the road by June 2019. Diagnosis: it was a faulty alternator. I checked with my mechanic to see if there was anything done wrong with the installation, but he confirmed it was a faulty alternator that was bound to fail sooner rather than later.
I contacted rockauto with this issue, since a new alternator shouldn't fail in 14 months, and they said there was nothing they were obligated to do since the warranty on the part was only one year.
Instead of standing behind their product, they're hiding behind their policy. Their lemon of an alternator ultimately cost me time, money, & caused much frustration. I will never order through them again and would caution anyone thinking about ordering parts through them that they are rolling the dice and once the house has your money they will never give it back.