Isn't Trop-Artic identical to the other oils in the ConocoPhillips line with the Conoco, 76, and Kendall brands, and probably Motorcraft? Nothing wrong with them, and probably nothing special.
Is the Korean S-Oil Corp. group III base oil that ConocoPhillips particularly high quality or low quality? I'm thinking low quality due to the retail price the ConocoPhillips syn blends sell for. Mix some Group II and some cheap Group III instead of the Group II+ base oil other blenders use, get a product that performs the same, and get a marketing gimmick boost.