The kayfun might be better for all I know, I only have the R91They are the same style/type of device, though
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In his reviews he said he liked the Russian 91% the best but in that video he said he chose the Kayfun over the Russian because the Russian is a clone of the Kayfun..... I dunno, it's not an exact clone and he said it worked better...
And his reason for picking the protank over the Aspires is he thinks the Aspires are ugly....
I was a big PBusardo fan but I'm not so sure after this.