Linsoul Simgot Supermix 4 - Good product, bad marketing.

[Dawnshine Wonder 4,879]

These do appear to be a good pair of IEMs from what I've researched about them, one problem though is Linsoul fail to inform people about the ins and outs of why they would need an amplifier that has a low output impedance, and because of that this could lead to some unfair criticisms of its sound quality from user error. The Apple Dongle DAC reportedly has a low output impedance but not every device with a headphone output does.

How a product is marketed does matter. And while people are reasonably expected to do research before they buy products, the fact of the matter is most consumers are not going to know that detail. I don't use IEMs myself, I prefer over ear headphones, but I do see validity in their use with people who do like them. 

I've seen good things about this device though, even comes with a synthetic leather case, which means you can carry it with all the accessories while you're out and about and protect your gear.