i didn't try the actual joico kpak reconstructing conditioner, but i tried the generic value products knockoff of it (not bad for only $4.79!)...
and i must say, i love it better than i love nexxus keraphix!
i could tell that it really strengthened my hair, whereas with keraphix, my hair only felt a tiny bit stronger when left in for the recommended time.
if the GVP version is anywhere close to the real version (and it should be, because it has all the same ingredients), then i'd have to say joico!