I don't own it, but I've been reading about it. Seems like people that own it love it quite a lot. I was looking into purchasing one.
https://www.pentaxforums.com/forums/125-flashes-lighting-studio/295459-venus-...-kx-800-a.html
Personally I ended up getting this one instead (the tentacles look like kind of drove me away) - please note that this version is for Sony cameras, not Pentax (there are others for Pentax as well):
http://www.bhphotovideo.com/c/product/675290-REG/Bower_SFD14S_SFD14S_Sony_Ringlight.html