Yes the M2S Pro with 150 ohm driver sounds the best for my ears. Sounds pretty close to the more expensive Yincrow RW2000 but cheaper all in. But for the 150 ohm driver, you will need an amp, as the impedance suggests.
As for the Western brands and Japanese brands described above, it is an open secret that most of them are made or assembled in China, or at least use China parts. Actually if you look at the stuff you are wearing and the stationary and electronics you are using now, I'm pretty sure most of them are Chinese made.
FWIW, I've had QC issues with JVC and Audiotechnica and some western (Westone, Senheisser) audio gear. QC for CHIFI is a crap shoot, but they cost around 10 times cheaper than a boutique/western brand, so even in the worst case scenerio that a lemon comes in, it still isn't as painful as a western pricier set coming in with defects.
Sounds good, thanks for the input. I will definitely take a look into the M2S Pro, with the 150 ohm driver. I have a good amp, but it is a bit clunky and heavy. Yet it can do the job. A major purpose of these portable earbuds is the "on-the-go" aspect, of their form factor, (plugging it straight into your phone, laptop, etc). That's why I'm leaning toward something like the Shozy BK. Will have to consider my options.
Well, some of my Audio Technica stuff is from Japan, yet it is true, there is "Made in China", on some of my other AT items. Nevertheless, I have had very good experience, with Audio Technica products. In my experience, when AT releases stuff under their name, I have faith in it, from experience. Regardless of the region of manufacture. The Foremen in the Audio Technica factories, well they have a standard to uphold. Mistakes don't "just slide", on the conveyor belt, (at least I hope not), compared to these other, more "shifty" companies. The same applies to JVC and Sony, I simply have not had, more than two or three, build quality problems, among all three of them, put together. On the other hand, cheap headphones/earphones, less than ~$20, well one can expect a company to cut costs somewhere, I don't get upset about cheap products breaking.
I think it is a blanket statement, to say that Chi-Fi stuff, is 10 times cheaper than Western and Boutique brands. Some Chi-Fi stuff is quite expensive. The VE Zen 2.0 is ~$150, same story with the Shozy BK, both Chi-Fi products. People pay $300+ for Moondrop Blessing 2 iem's, and other products from Chinese companies. If I bought one of those, and it broke within 1 year, I'd be ticked off, no doubt. Well-made headphones/earphones, can last 10+ years, in the hands of a careful person, (which is what I like to consider myself). Yours truly would not be a "happy camper".