When to do courses for certification

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I've just finished the A+ and have already started on 70-271. I'm a self-study man, enjoy doing it, have the time (mostly!) and have a live environment to play with (at work as well at home using VMware). If my company has a CBT or two I'll use them during my final revision stage - but where do classroom courses fit in?

My company is willing to put me on the courses for free, if I stay with them for at least a year afterwards, but I was wondering
1) while I can imagine they teach you the whole course, will it be similar to CBTs?
2) when would be the best time to use them? Just before starting any reading (which I doubt), or just before taking the exam using them as a refresher?

Any views/comments would be appreciated