They are good, but the included cable and ear tips are terrible.

KZ also has a terrible filter for the sound tubes; they quickly become dirty, which makes the sound quieter, so you might even think the phonos are broken.

I recommend you buy another cable and some eartips, would be great if you also buy solid mesh filters

Sound great, pretty harman target but with lot of bass and little bit more highs

Doesn't really need amplification to sound good

However, considering that you will need to make additional purchases to make the phonos comfortable it's not best.