When the Kayfun Lite Plus came out at $99, this became a no-brainer for me. I like to support original producers (SvoeMesto), and it encourages innovation in VapeLand. Prior to the PLUS, you had to buy the 3.1 to get the air flow control. I got both, and preferred the 3.1 because of air flow control. I preferred a slightly tighter draw than what I get with the Lite. Now the PLUS has AFC, and the 3.1 is discontinued (according to C9V). I heartily recommend the SvoeMesto KFL PLUS. Wish it was out before I bought the other two. Good luck to you. My two cents. YMMV.