Definitely agree with Juggernaut, you can fly your nice patterns with your foggels on but its a lot different in real IMC when the aircraft is getting tossed about and you are trying to hold a heading or the ILS. My old instructor tried to do as much as he could in actual IMC conditions so definitely helped when it came to doing it for real as you werent suddenly plunged into it. Its also quite a strange feeling the first time you enter IMC and the outside just mists over leaving you with just the instruments.