I don't have any of them but I do have a few Greys rods that I fish with. They are getting on a bit now, they are either Platinums or Platinum x with one Platinum x comp special, black rod with composite cork handle. They were at the time the top end of thd Greys range and I have variuos lenghts 10' and above, but 10' #7 is the mainstay.
I like them all, hence I have a few and they are all I use for my stillwater rainbow and river sea trouting. I do have a couple of 10' #5 I will use on occassion.
My only criticism I have is the early cork composte handle on the special, I think it may have been one of the first, gets a bit shiny and is not as good as a full cork. I would image they have improved since then.
As I am a Greys buyer, I would if given the choice choose the GR80 for that reason.