It gives you a skill that makes mastering items quicker. You decide whether that's worth it for you.

If you'd like to learn all Karon skills/master every piece of equipment, it very much is worth it.

it is worth mastering every single item, however the sticks ability has limited uses, I would say the only other weapon that felt like a huge grind beside the stick was the 3000 gold magic staff. So you could master the stick then use the ability to help speed up that staff.

i was able to master the stick in five rooms in chapter 5 . use the stick to kill demons seems to be the fastest way to level it....the lightning staff i was an idiot bout

i killed a bunch of slimes and the stick hasnt received any exp at all

nvm. it just takes a crazy long time to level up

Lvl the stick around chapter 3 later ennemies give better weapon exp

Yes. around chapter 3.