I dont get "upity",,, your scare mongering and exaggeration doesnt bother me in the slightest, I will simply debate the issue for as long as i have to when people like you come on and say every one ever made will have problems 100% for certain, when thats just not true and if you looked at the actual figures you would see that there are more that have NOT had an issue over the ones that HAVE had an issue.
OH and your a big boy you shouldnt worry about who you may upset, then you wont have to walk on egg shells .
Next, Look at what you just said about the ZD30, the exact same thing can be said about the YD2.5, in most cases of timing chain failure its the cheap tensioner that causes the probs and it seem more prevalent in earlier models.
I havent heard many if any timing chains going with only 70k on the clock and good service history, so i guess that makes timing chain failure pretty unlikely at that stage.