I use it regularly, like almost everyday, on the Z and my Canon 8300. It is the only fiber gloss media I ever use now and it looks great for everything on both printers.
It doesn't have anything to do with Hahnemuhle getting their act together.
My previous experience before switching to the Harmon has been with rolls of Canson Baryta, Innova F Gloss and Semi-Matte, Ilford Gold Gallerie, and the Moab version of the Innova. What I have found is that they ALL curl significantly. ( Maybe why Epson doesn't even offer Exhibition Fine Art in roll form). For me the Canson and the Ilford scratched much easier, even before it got printed. The white edges were always marked up badly. Not with the Harmon.
With my Z I have experienced a scraping of the emulsion on the 44" roll toward the far side in the last 1/3 of the roll more than a couple of times. It is just curled more toward the end of the roll ( as with all papers). That scraping doesn't seem to happen on my Canon. But with all these types of papers they are wound very tight. I often cut sheets off the roll and flatten them in my dry mount press toward the end of the roll.
If you use sheets you have no problems at all. The warm tone version is the same exact situation. Both excellent papers with almost no gloss differential or bronzing, that curl a lot.