KZ is surprisingly good for the price. I discovered them via /r/headphones and the whole chi-fi scene when i was looking for throwaway iems I own a pair of KZ zst's and while I can not speak on the behalf of these iems I can tell you somethings to expect from the brand:
DO NOT USE THOSE EAR TIPS, they are fucking horrible, you're better off wearing it raw and hard. Usable eartips are easy to find on Ebay
The cable might be shit too
The connectors on the monitors themselves are loosey goosey, you might loose them in their pants or give it a hard tug.
As always, it will be cheaper to get via your typical chinese ecommerce sites (Alibaba, Gearbest, etc.) but you might get faster shipping via massdrop (shocker) and better customer support.
JosegeddsHonestly I got really lucky when I looked it up on ebay. Best thing to do is get em and hope that whatever extra earbuds you have work.
Or look up on headfi.com or /r/headphones
sokolskeDisagree on the KZ Starline tips. They're some of my favorites right behind Sony Hybrids. Spinfits, Spiral Dots, and both types of Comply just don't work in my ear.