None
Did brew coffee ok.
Note the model shown on L.H side is not 4020 as this has a single flick knob in center rather that buttons shown.

Very poorly built. Very small tray at bottom which was twisted and didnt fit well.  Poor peformance. Inability to steam[ froth ] the milk. Runs out of steam after about 30 seconds.
Too much plastic to twist and buckle over a period of time.
Appeared to be a bit flimsy on construction

I read book very carefully and followed directions to froth milk. Quite often the frother noozle would fall off and shower steam and milk everywhere to about 2 feet away. And the noozle was poorly constructed with a small tube that after a period of time was liable to fall out of the rubber holder.  There is no secure way the noozle locks on and is just a push fit.    Which could be quite dangerous and could scald anyone.  Also when bleeding water through to get it to steam and turning knob as instructions heaps of water would end up in the tray.  Sometimes the tray would overflow with water onto the bench.
Appeared the steam was restriced by a small hole in the rubber fitting.  Being rubber im sure the hole would increase in size too easy.
It sounded like a steam engine.
The attachment for making the coffee was ok and that part worked fine.  
My old Sunbeam Cafe series worked far better and had bigger capacity water tank and tray and frothed milk better.
Apart from that the Krups construction didnt look to long lasting as too much plastic used.
Like most Chinese made products these days.

Bought from store and no complaints with Harvey Norman service.