The difficult[3] work was "calculated to display Slavík's virtuoso [violin] technique" and is demanding for both instruments. According to pianist Nikolai Lugansky, the Fantasy "is the most difficult music ever written for the piano", and "more difficult than all of Rachmaninov’s [piano] concertos put together".[4]
Montgomery, David (1997). "Franz Schubert's music in performance: a brief history of people, events, and issues". In Gibbs, Christopher H. (ed.). The Cambridge Companion to Schubert. Cambridge Companions to Music. Cambridge University Press. ISBN978-0-521-48424-4.