See the head gasket thing is wierd.
My mates had a ZR for a year, had no problems
Ive had mine about 6months, had no problems.
Someone at work has had hers for about 3 yeas, no problems
i know loads of people from net who have had theres years, no problems.
But then ive heard of many of problem from others
Pne mate had one for 4 months, had 2 go, but he did chip his, and added a turbo (i think), and also drives like a nob, so i was not surprised.
And spoke to a few people on net who have also had there problems.