fluor kick waxes?

About a decade ago Swix and Toko and probably some others came out
with fluoro kick waxes -- VF for Swix and Dibloc for Toko. These
no longer exist and have been replaced I guess by VR and Carbon.

At the time the claim was the fluors would drag less during glide.
I remember hearing talk about layering them over or under non-fluor
waxes. I never spent enough time experienting with them to gain a
decent understanding of their characteristics.

So what happened? Were they too slippery to kick well? Do VR and
Carbon have better grip and at least as good glide? Can one achieve
similar results to the VR and Carbon waxes by layering the fluor and
pre-fluor waxes? [Does anyone besides me have a waxbox full of this
stuff and want to use some of it up before investing in yet another
line of waxes?] :-)

-Mitch