I think installation quality makes a HUGE difference. There was guy who got Sato knock-off rearsets and fought with installing for days. Was about to return them to get genuine Sato when someone linked to install guide. Turns out both Sato and their knock-offs required flipping rear master-cylinder around to install properly.
There's also lots of randomness in racing that can't be predicted. My first crash in first season snapped off solid foot-peg, bent frame-mounting point, and bent my Woodkraft rearset so much, it rubbed on swingarm. Replacing them with Ali rearsets with folding pegs lasted 3-seasons now with 3 crashes and they're in great shape!
As with any shopping, there's no 0/100%, all-or-nothing, black & white answer. Costco is not always better than Safeway. Some things are better from Lowes than Home Depot and vice-versa.
With any online shopping, be it Amazon, eBay or Ali, you should do research. Look at vendor rating, product reviews, technical specs (alloy-series, heat treatment, etc), and warranty. I've paid extra for 3rd-party extended warranty on eBay electronics and it's paid off. Many Ali vendors actually have decent warranties.
As mentioned in my racing gas-cap thread , being someone who've had products made abroad, I see many areas where corners can be and are cut. Quality level is dictated by importer and resellers. Foreign manufacturer just produce to specs they're given.
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