Kai'sa's invisibility getting shorter feels bad.
Playing her is a blast but the amount of time you spend invisible decreases when you purchase more Attack Speed. This feels really bad in any scenario where attacking as much as possible isn't your goal (when you're fleeing and want to juke enemies in the bushes for instance).
It might be changed this way: the amount of time you need to charge is reduced, but you can stay invisible the max duration if you keep E pressed.
Edit: totally my bad, I was just attacking as soon as the charge ended and in the tooltip I thought it was invis and charge time but it only is charge time. Dunno if I should leave this post with the edit or just delete it.
Thanks for correcting me!