You can't go wrong with a provari. The Russian, from what I've read, is a real device. It was put out by someone who was involved with the design of the kayfun. The difference was the adjustable airflow, which svoe mesto copied on their latest generation of kayfuns.
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This is an urban legend that has no basis in fact. The Russian and the Russian 91% is a clone of the Kayfun 3.1ES and the Kayfun Lite respectively.
The Russian 91% did add adjustable airflow to the Kayfun Lite design to distinguish it from a 1 to 1 copy.
From everything I can tell, someone is genius over at the manufacturing plant that is responsible for the Russin.
First of all, they concoct a story about how the Russian is really the "co-design" of a fellow employee who wanted simply to move manufacturing to China to allow for more volume to be made.
Then unlike other clones, they charge nearly the same price as an authentic Kayfun.
So now instead of a "cheap" knockoff, they offer westerners an "expensive" knock off.
There is no doubt that the Russian itself is a quality manufactured product. But in creating an urban myth on it's origins, and charging nearly the same price as an original, they have been able to sell to gullible purchasers who would NEVER think of buying a "cheap clone" because it goes against their spirit of what is "right".
I guess I'm not laden with such feelings. I buy the HCigar Kayfun 3.1ES clone for several reasons.
1. The original Kayfun 3.1 ES is no longer available. I can't buy one if I wanted to. I prefer the design of the 3.1ES because it has not only adjustable flow control, but a drip container to hold fluid that leaks out and an adjustable 510 screw.
2. The HCigar is 1/4th the price of the original Kayfun
3. The HCigar has gotten good reviews from other vapers based on it's build quality and performance.
4. A lot of Authentic Kayfun Lite Plus components are compatible. I picked up the 2 authentic Lite+ oring kit from vaprevolution (vaprev.com). Not only do all the applicable orings fit, but the actual deck screws as well. This tells me the HCigar version is pretty dang close.
5. Real Kayfun Lite Pluses are hard to come by and I do not particularly prefer the design of the Kayfun Lite Plus.
6. If I am going to buy a clone, I'll buy one that costs less than the original, not more.