I bought this KZ Castor about 7 months ago but it stayed unused for almost 4 months because I didn't have a DAC dongle at the time. I buy IEMs mostly as a hobby and like exploring different tunings, so I'm selling this one to try other sets.
The reason I bought the Castor is because it performs way above its price. It can easily compete with IEMs that cost almost twice as much. The bass is tight, punchy, and very clicky with good impact, not muddy or bloated. The treble is clear and detailed, which makes the overall sound feel clean and surprisingly technical for the budget.
I won't be including my aftermarket cable or eartips since I bought those separately, but I will provide the stock cable and tips that come with the IEM.
You can come to my place and try it before buying. DM or call for more information.