This collection highlights the unique compositional niche of the left-hand-only etude, a genre popularized by Fumagalli for its sheer physical spectacle. It is a rare example of solo writing that demands the pianist treat the left hand as a fully orchestral entity.
Mastery of rapid jumping and sustained power in the left hand is the primary technical barrier.
Comparable difficulty and character — good candidates for what to learn next.
2 Concert Studies for the Left Hand Alone is rated Henle level 9 of 9 — virtuoso repertoire, roughly concert / virtuoso level.
You should be comfortable at Henle level 9 — meaning you can already play level 8–9 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 2 Concert Studies for the Left Hand Alone lasts about 8 minutes.
2 Concert Studies for the Left Hand Alone 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 2 Concert Studies for the Left Hand Alone by Adolfo Fumagalli, Pictures at an Exhibition by Modest Mussorgsky, Ballade No.2 by Franz Liszt — see the full similar-pieces list on this page.