I'm on MQ right now. Like you, my center never mentioned it, and I had to ask. However, when I tell them I want to go on it, they are usually very encouraging. My program expires the end of August, and I still have a little over 20 lbs. to go, so my person suggested that I try to get MQ in a second time in August.
I have always found it to be very helpful-- usually lost an average of 6 lbs. on MQ weeks. However, I am super-hungry on it. It's a week of misery for me. I'm not getting headaches, but I'm grumpy, and I really am hungry all the time. I'm on day five right now, and it's catching up to me. However, since I'm so close to the end of my program, I'm going to stick it out for the quick results. So far I've lost 7 lbs. on MQ this time.