The Wikipedia page is
here. You can buy one at Amazon.com
here, or at a number of retailers.
I'm not a coffee drinker, but according to DW, the resulting coffee is a
lot less acidic - she has a hard time going back to brewed coffee now.
The manufacturer claims that it produces expresso, which you can then water down to get regular coffee. My DW drinks it strong - almost all Aeorpress, with just a touch of additional hot water. I don't think it's really expresso-strength, but it can definitely be brewed much stronger than your normal coffee.
HTH,
Bob