Digital pianos have come a long way in just the last few years. many music teachers, universities and performing artists are choosing digital pianos for a variety of reasons. Here are a few of those reasons.
Quality digital pianos are virtually indistinguishable from the real thing. They feel the same, with weighted keys, and have the response and sound of a $100,000 concert grand piano. They are maintenance free and never need tuning so they sound good all of the time. The volume can be adjusted, they are very light weight compared to there acoustic counterparts. They can be used with headphones, and many of them offer hundreds of realistic voices and rhythm styles to play along with.
Many of them also offer specialized software included in the piano to help expedite the learning process and make it more enjoyable for the student.
This doesn't mean they are better instruments, but they are convenient, reliable, sound great, easier to move, great for recording, teaching, and beginner students tend to "practice" more on them.
The main downside is that they don’t go up in value like acoustic pianos, much like computers they tend to lose some value as technology advances and a newer model comes out.
Also, there are still many purists out there who believe there’s nothing like the real thing.