I bought a Westinghouse iGen 4500 generator for our bus that checked more boxes than any of the others I looked at, and found one for about 30% cheaper than the lowest price elsewhere on Amazon. It ran like crap. Smelled like raw fuel, vibrated like crazy, way louder than it should have been. But it came with a 90 day return policy and I used that time to take it to an authorized repair shop. They found the defect, replaced the parts, and it didn't cost a dime extra, though I did have to drive a few hours to the shop to drop off and pick up. It's a sweet machine, now.
Harbor Freight stock use to suck. Some of it still does. BUT... some of it has gotten so much better. Their Chief brand is solid, so is Predator, and Hercules. Their hydraulic stuff has never let me down. I'll purchase tools that I need for a single job, but if it's something I will use regularly, I buy elsewhere. Sometimes you run into absolute crap. They have some sets of small drill bits (below 1/8") that are absolute crap because they have no cutting edge. My 1" belt sander from there crapped out on me last week, but it took 10 minutes to figure out it was the power switch and 20 more to install a new switch. I even have a milling machine and engine lathe from HF that aren't the greatest, but they sure serve their purpose and have more than paid for themselves. FWIW, I'm planning on liquidating most of my tool collection in the next couple years so I'm not going to over-invest.