Some players prefer them to speed boots in an ascension kit. The boots are especially useful to those who ride a steed that is already quick (like warhorse or ki-rin) but also want the ability to jump.
Cursed jumping boots will still allow you to jump but cannot be unequipped and will likely carry an AC penalty.
Jumping boots allow you to jump in the following pattern:
......... ....x.... ..xxxxx.. ..xxxxx.. .xxx@xxx. ..xxxxx.. ..xxxxx.. ....x.... .........