I have a Sunbeam EM6910.
I use only filtered water (the inbuilt filter hasnt needed changing as the water is of good quality), but the steam pump went after about 10 months. It took about 2 months to get repaired as there was such a demand for the job to be done there werent any replacement units in Australia.
I had it home and working for about a month when the espresso pump lost power.
The pumps have a 5 year warranty - great because youll need it to have the pumps replaced regularly. Look around and I think youll find though the Sunbeams do a nice job (thats what got me in), the reliability of the Sunbeams just isnt there.