Hifiman RE300 in-ears (multiple versions) for $25

Multiple variations of the Hifiman RE-300 in-ears are on sale for $25 by various sellers (including Hifiman themselves) with the orders fulfilled by Amazon, so free 2-day shipping for Prime members (or the usual $35+ free super-saver shipping for non-Prime members)… There are trade-offs to these, as you can tell by the review scores… There are at least three variations “h” (no mic/buttons) and “a” (Android) and “i” (Apple)…