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The Super Thin and Super Stainless are two different blades, at least they labeled and sold as different blades.
I like the Super Thin ones, I only have a few shaves with them so I am still forming an opinion, but would say they are on par with Derby, feeling a little sharper. This is when shaving with a Merkur Barberpole.
There are two different Asian Super Thin blades - at least the package is different. One is written in Vietnamese and the other is written in what I think is Thai. I've tried the latter, and I think they are quite nice and definitely last longer than two shaves.
Same here. But I have bought myself a hair styler that works with DE blades. So the ones that do not agree with my face can do my hair. For that purpose they are just fine.