Judging from my observations of the ever expanding Breville help me threads on another forum it seems 3 years is about the period of trouble free operation you can expect from one of these appliances, from this point the problems seem to come thick and fast.
The threads I'm referring to have reached biblical proportions and continue to grow.
I realise there are probably more Breville machines sold in OZ than all of the orher makes put together, regardless, the failure rate does seem high.