6500 flight hours on ATR 42/72-500, in europe,...what can I say is to monitor carefully the speed while in ice accretion, and to select flaps15 if speed comes below red bug....otherwise if deicing systems are working properly, is no reason of fear, but, never try to climb, if terrain permits you have to descend, and be aware 1degree celsius is enough to escape from severe icing.
Nice flights!