Whatever dude. I worked for NAPA for 16 years, and a good chance I will be again starting next week.
The Napa "Truestop" Rotors are made in China, and they exists to allow NAPA to compete with mass merchanidiser such as Autozone, Shucks, Advanced, Checker.....and on and on. They are perfectly Safe to use and meet DOT standards, but the chamfers on mounting holes will not be to OE specs, and vented rotors will have fewer cooling fins. They also will typically need to be turned before use. By contrast the Napa "United" Rotors which are made in North America (usually Canada, sometimes U.S.A.) will match the OE exactly, with the same chamfers and number of cooling fins. In addition they have a hard-face surface and are guaranteed 'true' out of the box so they can be installed without turning them.
Same for brake pads...... $10 pads will meet minimum safety standards but they will not last very long, nor will they stop nearly as fast as the premium pads that may cost $40, $50, $60 or more. The cheap material does not dissipate heat nearly as well, so the pads get hot, and the brakes fade, causing longer stopping distances - - not to mention faster wear on the pads.
Again these exist to compete with mass merchandisers, the people who patronize those stores are simply too big a market to ignore and there are always people who want the cheapest they can get, sometimes by necessity. But for those who want quality the more expensive stuff is better. and Invariably it's the stuff made in China, India, Taiwan, etc. that is of inferior quality. Notice I didn't say cheap Japanese parts.... the good stuff comes from USA, Canada, and , yes.... Japan.
Oh and sorry , adaptabl, to use big words such as "chamfer" and "dissipate" - - I'm sure you'll have some sort of put down reply to me after you go consult your dictionary.