Honestly, I'm not "a fan" but in the recent years I got 3 as I heard they got much better than they were in the past and guess what? I like them!

I got:

• NiceHCK Traceless
• Moondrop VX Classics
• NiceHKC Eb2s

Out of those I like the moondrop one more, as it is more detailed and brighter but of course it simply won't stay on my ears for the life of me.
The EB2S is very good but believe it or not I loved the sound of the traceless, which I bought for about 3 dollars. It was so cheap I'm giving it to a friend of mine who likes earbuds.

OP, which of these is your favorite? I am considering forking some cash for the Fiio FF5 but it's quite a leap from what I have and I'm cautious of weather it will fit my ears well.