A very disappointing app that hides its embarrassing bugs and flaws behind the admittedly nice interface design. - The line-by-line syncing proccess is slow and laggy. God forbid you accidentally sync the line too early or too late, because then you have to fight with the "+" and "-" buttons that usually take a few seconds to respond. - The word-by-word sync works well, but when I play the song back in the app or Spotify, there's a 1-2s delay. - The workspace can crash while I'm syncing.