For this time I am with Ratch.
I wear now my second pair of Z6.
The ‘oldies’ who know me, they know I have had few different brands of tyres and I never have been that enthusiast about the Z6.
I would say, The Z6 is even better than Pirelli Diablo.
There is one disadvantage, if you are not riding your tyre in, at least three years, off, better use sporty tyres. They are faster worn. To wear tyres for a long time, the rubber will change his typical property. A Z6 after three years and with only 4000km running, it is just shame to through away.