I did the MCC at CTC in August and thought it was excellent. They go way beyond the requirements for the CRM classroom part and the MCC on a B733 sim, although fixed base, was great fun and very informative. You really learn to think at a different pace!
I would however give everyone one piece of worthy advise: go with a pal that you know can fly as well as you do, and will learn at a similar pace. Someone you've done the frozen ATPL course with, for example. Reason for this is that I was paired with a very slow learner, and a very rusty flyer. I got a bit frustrated with this, because I was also there to impress some instructors, as CTC have the best connections in the industry. As it's all supposed to be done in multi-crew concept, you're to operate according to set SOPs, but I felt compelled to help my captain/copilot (whichever role we were in at the time) in more ways than allowed, in order to get the plane safely on, rather than in the ground.......