Should anyone be considering buying some Armstrong wavy discs for their ZZR...........DON'T.
Apparently they're not up to the job and unable to cope with the weight and braking forces. Mine have worn below the minimum limit in 4500 miles and I'm not what could be considered a 'hard' rider, and don't use the bike on trackdays.
So, having thought long and hard, looked at other people's experiences, and then applied logic and rationale, I have come to the following conclusion.
THEY MUST BE SHIT
(My 1999 Fireblade with 25,000 miles on the clock has the same discs it left the factory with)