I have an authentic Kayfun lite v2 plus and Ehpro Kayfun Lite plus clone, looks wise, it's the same...feel wise, the authentic is more refined and the clone is not as polished..functionality, the clone is little tighter on the draw, but functions mostly the same.
Value wise, 100% goes to Ehpro, you get nice case, extra tubes, spare parts, etc..and hits very well...it runs under $40.00 shipped from most Vendors...it would be very hard for me to recommend authentic after having the Ehpro ...
The only thing I did with clone is sand the base a little bit, it was sharp enough where I could cut my hand when twisting the rings together ...but that's it...after a nice wash, dry and build, the quality was good enough ....just don't use tank buster juices with Nano tank..