Pretty Convenient, Somewhat Annoying

[leader of mortals]

Convenient: Getting the blood sword, holding down X (after breaking out of the hanging cell), and being able to level for hours because of the continuous amount of guards

Hell yeah Pt. 1

Inconvenient: The one time item events that you missed cause IX has the worst official strategy guide of any game period...

Hell yeah Pt. 2

To be original, however, I would say...

Convenient: Being able to have super awesome equips from Chocographs really early.

Annoying: Not ever being able to remember if the boss in Ispen's castle needs weak weapons or notNOT ENOUGH QUINA!