I have an authentic Russian 91%, a better "clone" of the original KFL. Because of the 91, the KFL+ was born, I believe. I also have an EHPRO clone of the KFL (no adjustable airflow) and for me, while the Russian is better, it's not twice as good as the EHPro as the price would suggest. I also have a Tobeco clone coming and a Fastech Kayfun 3.1 clone coming. I like to have one original (still can't find the KFL+ in stock anywhere and I'm not paying a $50 premium between converting to pounds and paying shipping from Europe) and then I don't mind getting clones as well. Just doing my part I guess.
Anyway, back on track, KFL's are fantastic, highly recommended. They do not have a super airy draw like a dripper with 1/16 holes in it, but for me, the draw is perfect.