I mever had a kayfun, is it worth 180?
If you can afford it, yes. If you can't then a $20.00 Tobeco clone it's just about as good. IMO.
HD
The kayfun v4 may not be worth it to some, but that's no reason to run straight to the clone market.
You can get an authentic kayfun Lite Plus for like $70-$80 shipped from a number of vendors...
That would be the next step down from the Kayfun v4, before the clone market.
Now, as we've found out (the hard way) there are some folks who are extremely sensitive and defensive of their clones, and their authentics...so I want to be clear that I own both authentic -and- clone KFLs, but only an authentic v4.
If you're looking to go clone, I can HIGHLY recommend the EHPro version.
There's no need to recommend the authentics, as they pretty much speak for themselves.