I guess I am relatively serious for an amateur but the piano is a very difficult instrument to master and so I just feel like since I have such a limited time to practice I rather make that time as effective as possible. That means playing on an acoustic and thus making a lot of noise sadly..
http://usa.yamaha.com/products/musical-instruments/keyboards...
The action is the same but the way it reacts and sounds isn't, and at least for classical music, learning the nuances of the sound (and pedal!) is the hardest part..
The "make it sound like a wood-and-felt-and-wire piano" issue is solved. The "make the key action feel like a physical piano" is (based on my extensive side-by-side testing) close enough to solved that -if one's concerned about bothering the neighbors with the sound of your playing and one has the money- purchasing a good model is a no-brainer.