Let me put it this way. I loved the kayfun's they were my goto tanks for the past year. I have 3 KFL+V2's with the dual air holes took the adjustment screws out and ran them wider open. I had the Kayfun V4 clone took the air adjustment screw out of it and ran it wide open. Traded the V4 for my first kanger sub tank ( the big one). Loved it so much I bought 2 of the kanger sub Mini's. All the kayfun's have been retired now. Will be selling them off soon. The flavor, build quality, ease of use and fill has made these my primary RTA's. The option of either using the stock OCC coils or the rebuildable deck is a winner. Not to mention the OCC heads are a snap to rebuild as well. No, I don't work for kanger. Just a very satisfied customer.
Read your comment and thought,is he reading my mind,I too have a KF plus,and I am about to give it away,not because it is not good but because I have trouble getting the build under the screws,I do succeed,but after many attempts.
Then I seen the Kanger Sub mini,my eyes lite up,my thoughts ,a 12 year old can build this.
I'm 72,eyes not as good as my youth,the build on the Kanger is where I'm heading,I'm going for one,I'm on a limited budget but I will figure it out,with hopes of getting a few more years Vaping.Tc