I have used it for years... First tried it a long time ago when I worked in a ski shop and got some samples from a rep.
It works really well for me. I'm in the PNW (Vancouver Island), so I ski Mount Washington and Whistler/Blackcomb.
The thing with me is that after I go skiing, I never really know when I'll be able to hit the slopes again (kid's hockey and soccer schedules take priority over ski days right now). Weather and temperatures can change a lot if it's a few weeks between ski days. So I always have the whole family's skis ready to go with a layer of F4.
I hot wax, scrape and brush it just like you would any other wax, and it seems to work quite well. It also seems pretty durable.
I hope that helps.