My MCC was completed at OAT, but as an integrated student I didn't exactly have much choice in the matter as it was included in the price.
Having said that, I reckon it was by far and away the best part of the entire course. The instructors are all top blokes, mostly ex-RAF and corporate pilots. The kit they use is a lot of fun, and unless you are a complete spotter, more than real enough to get the job done. The procedures are all based on bmi 737-400 ops for those that really want to know these things.
For what it's worth, if you are looking to do this as a stand-alone piece of training, go visit these places, check out the kit, the training manuals and talk to the instructors about their experience. But remember, it is to get you an MCC certificate and to experience the skills involved, not to teach you how to fly jets. Look forward to some feedback once you've got the certificate in the bag.