No. While it primarily serves the Hanbali school, its comparative nature makes it a primary source for any student of Fiqh. It is often taught in Islamic universities (Al-Azhar, Umm al-Qura) in "Fiqh Muqaran" courses.
Ibn Qudamah designed a progressive syllabus for studying Hanbali jurisprudence, with Al-Mughni serving as the final, advanced stage: