As far as I'm aware, they aren't officially available over here.
RustyBuzz and Mach 1.5 (maybe some other fortunate peeps, too?) have them and will hopefully drop in and advise.
Many don't like the "thumpy nature" with that big, heavy piston. But I have briefly tried a couple and quite like it.
Reportedly beautifully engineered as you'd expect from FWB and I would love to give one a home.