In the olden days. all right maybe 25 years ago, a student who wanted to take piano lessons had very few options for a practice piano. The parents of students had two option:
Option number one: they could take their chances with a used piano; and believe me that can be like navigating through some very rough waters! How many times in a life time does one buy a piano? There is so much to learn and still the expertise of a piano technician or a piano dealer were needed.
Option number two: they would buy a new acoustic piano with a 10 year warranty from a reputable piano store. Better safe than sorry!
Today there is a third option a digital piano. For the best value in a starter piano I believe there is no better value today than a Yamaha CLP 430. Its not loaded with hundreds of bells and whistles and the piano sound is sampled from Yamaha's premier instrument: the concert grand piano.