I have the authentic KFM3, so I can't speak to the clone version.
Beautifully machined, perfect fitment all around...exceptional quality one would expect from Svoe Mesto.
The only issue I've experienced is gurgling, but once I got the coil height correctly situated above the air flow hole and got it wicked properly it's been a fabulous vape. Definitely operator error.
The main thing I like above the KF4 is the size. It gives my new 2.5 gun metal blem a svelte appearance and is soooo much lighter. Being retired and at home most of the time, I can deal with the 2ml tank capacity, no prob.
Very pleased with it.
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I work from home, so it holding just 2ml isn't an issue for me either.




