We're speaking of the ones that make cappuccinos. The smaller bialetti's do not and they are much cheaper.

"The voltage problem can be solved with an adapter."

Just to be clear, the solution is really a converter. An adaptor just makes the plugs match. If you are going to do this, don't skimp on the converter, as most are not really intended to power items for the long haul. I would even go so far as to speak with an electrician to make sure that it isn't a completely stupid/dangerous idea.

I did quite a bit of research before I purchased a Rancilio Silvia espresso machine for my husband for Christmas. He really loves it, and it appears to be quite well made. We have used cheap machines for the last 10 year, and its a pleasure to have a great Italian made machine.