I did Ex.19 last saturday, and at the end of it my instructor took me into cloud (not hard!) and made me do a 180 degree turn out of IMC "for real". Much more useful IMHO than just doing turns, climbs etc. in clear sky with foggles on.
Then, for "fun", he made me track a VOR to the airfield and then fly the circuit still with foggles on. I only started looking out the window again at 500 feet on short final (and did a cr@ppy landing!). Brilliant fun, but hard - even with plentiful assistance. Definitely going for the IMC after the PPL <img src="smile.gif" border="0">