Definitely. The novel expands on the already fascinating 'hunter x hunter' universe. It delves deeper into the lore, exploring different aspects of the hunter world. For example, it might introduce new types of nen abilities or hidden histories of certain clans. The character development is also a strong point, as you get to see the growth and change of the characters in more detail compared to the anime or manga in some cases.
The Hunter x Hunter manga is unfortunately not complete. The author has faced various issues that have led to intermittent breaks and an unresolved storyline.