The Lemo seems nice... I like the post holes, although it's not a necessity. However, the 23mm turns me off from it unfortunately. And it's rather large... if it came in 22mm and a nano sized version, I'd be more compelled to get one.
Also,
here are the differences between V1 and V2 Kayfun... the Ehpro version is shown here, not sure if this applies to the other clones. Actually... I just looked at my HCigar V2 Kayfun (which looks exactly like the Infinite one), and it has the same top cap design with the protruding ring around the chimney hole. I assume they are the same but I could be wrong.
The nano kit on the V2 is NOT the same as the V1 nano kits. The V2 nano kit is larger (the one that came with my HCigar v2), and it uses the flat top cap instead of the standard one. I doubt they are interchangeable with the V1 version.