I just found some words I agree with when considering buying a digital piano for your children to study piano on:
http://www.piano-tuners.org/piano-forums/viewtopic.php?f=7&t=102
and
http://www.opusmusiceducation.com/blog/2012/06/pianos-vs-digital-pianos-vs-keyboards-how-to-choose-the-right-instrument-for-you/
I believe you can find a used acoustic upright (even a spinet piano) that costs the same as a digital and you will have a better instrument to develop a better technique.
Cheers, Bill
