This article is from the Digital Pianos FAQ, by Isako Hoshino rmmpfaq@yahoo.com with numerous contributions by others.
The general consensus is that digital pianos can take as much pounding
as a piano can. One would hope that the manufacturers have designed
them with that in mind. But there have been reports of people
chipping the plastic on the key, or losing a spring which helps the
feel of a weighted action and have been playing gingerly ever since,
but this seems to be in the minority.
 
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