I take no exception to any of that. I seek only point out that this is a (possible) legitimate difference in the products. Your desire for citation is understandable, I know Xfoo, and you don't. His word carries significant gravitas in my mind...if he were a stranger to me, I likely would require proof.
For the record, he speaks highly of the Russian in other posts I have read of his.
Like I said in my prior post, the 91% has clear and relevant design improvements over the KFL. It is legitimately a better choice for some vapers.
Very interesting. I guess the question is, are there any juices out there which would create a corrosive environment for 303, A2 or A4 stainless. Also, would any difference in the use of these grades of stainless steel equate to any taste benefits from one to the other.
I mean, I could create a tank from solid 18 Karat gold (yes I know it's impractical but bear with me), but if it did not provide any taste or performance benefit, then what is the point?
I kind of compare this to the use of pure platinum in the Wizard evolve. Sure Platinum is strong and light, but it appears to be used simply for the cache of using platinum.
The choice of A4 stainless in the authentic Kayfun seems to be a similar choice. It is to add a level of exclusivity of the device simply for the sake of making owning one exclusive.
I am a little more careful making assumptions since I used the same logic regarding the ProVari vs something like the MVP. However enough people on this board have mentioned that there is absolutely no performance difference between a high quality Kayfun clone and an actual Kayfun, that I am a little more comfortable with my Kayfun clones.
Personally I wish SvoeMesto would release a "value" version of the Kayfun that puts it in the $50.00 price range, and is able to be produced in MUCH greater numbers. I would much rather SvoeMesto get benefit from my wallet then a clone manufacturer.
Actually what I think he SHOULD do is everytime he obsoletes a design, he should release it as a lower cost value line in 303 stainless.
Like now, he could re-release the original Kayfun 3.1 ES and original Kayfun Lite in 303 Stainless versions at around $50.00 while keeping KFL+ at $90 or more using A4 stainless. I wouldn't even look at a clone then. Those who want the "A4" models can pay for the limited runs, and those who simply want affordable devices can buy his "value" line.
There will always be those who buy cheap clones, but there are those of us who would be willing to pay right at the mid point for a more affordable and more importantly more readily available "original"
. But to me, $89 for the R91 vs. almost $70 for an EHPRO clone, was a no brainer. Also knowing that if I don't like it, I can turn it on the Classifieds and lose less than what a pack of cigarettes go for these days, why not 
was built because of the KFL+. 
