Hmm, looks like I'll be buying a 12113 after seeing your unboxing of it Nikki. I'm curious of preliminary results

It has decent words on this thread, so even if the fill hole were to be leaky I could fill from the top. Or if it whistled I'm sure I could get used to it.
One thing I haven't found the answer to is does it have adjustable airflow?
I wish they had VV/VW stuff, specifically Sigelei items. Then I could do most of my shopping in one place
I really, really like this KFL, and somehow the flavor production on it is better than my 3.1 ... And I am actually glad that this one does not have adjustable air flow because I believe that the adjustable air flow is the true culprit behind all the whistling Kayfun's ... this one does not whistle at all, and I find the air flow to be perfect, neither tight, nor loose.
I top filled this KFL on my very first fill however, in order to continually use the top fill method to refill, the tank must be empty because the chimney screws off with the top cap, which is not a good thing if there is e liquid still in the tank.
I have now used the fill port twice to refill, and while I wouldn't say it leaks, I did notice a small amount of eliquid on the top cap of my mech, when I removed the KFL. But it was not by any means a significant amount of liquid, because I didn't even notice it until I unscrewed the Kayfun. So I think this small amount comes from any residual e liquid around the fill port itself (a result of liquid passing through the port), but it does not "leak" per se.
However, when I used the top fill method, there was absolutely zero eliquid present around the fill port, or base of the device.
ETA: the small amount of e liquid on the base that I spoke of was definitely excess top off liquid because I just removed the KFL again from my mech, and the base of the device ie:fill port is bone dry.