Only played 1 full game and it was marred by a 5 minute major so didnt really get to play much
In my second I just got a 2 min for holding someone against the boards
EDIT, just got another for holding against the boards, playing this game on Hardcore and I only did it for a few seconds so looks like you wont be able to hold on too long before getting penalised for it.
I think it will take a good few games to give a good opinion on it because even if you dont get any penalties its only 5 min periods so its difficult to get into.