Not on the Z, but running them in 20" variant on my XF. Very pleased with them. Manage to keep near 300hp and 600nm rwd on the road and as a bonus to echo what JDM says cool tread pattern.
These are £134 at tyremen.co.uk ... But if you tell them that you're from the forum you may find that they knock a few quid off the camskills price. If these are rated I may look into them in a month or two as they're a decent amount cheaper than the Vreds I was looking at
Cant comment on the ZZ3, but I have ZZ5s, which I understand are replacing the outgoing ZZ3s (could be wrong on this though). Very good grip dry and wet
Had a set on my first e34 M5 when I bought it, but didn't get on with them. However, that could simply have been down to me being inexperienced in a powerful RWD car, or that the tyres weren't exactly new, rather than a fault of the tyre.
Got these on the rear of mine.
Can't really comment compared to anything else as they were brand new on when I bought it.
But would defo say be careful at first. Have done about 500 miles on them now and they seem to be getting much better, but were fairly slidy at first.