Is Hanon good for piano?
Hanon exercises feature in households all around the globe, and for good reason. These piano exercises, which have been in existence for over 150 years, are proven to massively improve THREE key areas of your piano playing.
Are Hanon exercises useful?
Hanon exercises are great for helping you isolate particular "riffs", if you will, that are difficult to play. The idea being, if you repeat them ad naueseum, you'll be able to play them. In the end, any given Hanon exercise will be useless unless you're playing music with figures that are similar to the exercise.
Is Czerny or Hanon better?
Czerny is more 'musical' than Hanon, so maybe more enjoyable. Hanon is much simpler, and much easier. The thing about scales is that they are good, but they are one type of pattern only: the etudes/exercises are much more varied (and Hanon includes scales and arpeggios). Schmidt is also good.