My only problem with Kayn is it can take about 15-20 minutes to get the transformation you want.
For those who play Kayn, you know the situation I'm talking about. The game is 15 minutes in and your passive meter is almost filled and a team fight breaks out. You don't really have a choice on who to hit and when the fight is done, your passive is filled and you get the transformation you don't want.
You then have to wait about 4 minutes more the get the Kayn you do want.
Has anyone else experience this? It quit frustrating to wait that long to transform.