Theodor Kullak was a legendary piano pedagogue, and his compositions often serve as bridges between technical exercises and concert repertoire. This Ballade is virtuosic and requires a strong grasp of Romantic bravura playing.
Maintaining rhythmic stability during high-speed, agitated arpeggios is the central challenge.
Comparable difficulty and character — good candidates for what to learn next.
Ballade (Op.54) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Ballade (Op.54) lasts about 8 minutes.
Ballade (Op.54) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Allegro di Bravoura by Theodor Kullak, Bolero by Theodor Kullak, Bolero di bravura by Theodor Kullak — see the full similar-pieces list on this page.