Hmmm, I must say that I found my ZX6 less tough than its predecessor (dex410).
Getting hold of spares for me wasn't an issue but then again my favourite store's owner also run a ZX6 so kept pretty much everything either in store or in his pitbox.
If you're struggling with spares drop me a pm and I'll give you some contact details. Alex is really very good at support/prices.
To a different front I have now sold mine, since I simply didn't get on with the car.
For me the finish for the price tag wasn't as good as it should of been (it is the most expensive 4wd buggy out there and for that price the standard should of been higher IMO), it seemed more fragile than the competition and also whilst responding well to setup changes, it also seemed to want the setup chasing for the car to be drivable. So I have moved on to a cheaper car that is easier to drive and so far tougher...
I still really rate the 2wd 6 series cars, but the 4wd was simply not for me. Shame.