Do you frequently get case-related guests for cases?

Today we (HBS students) had the CEO and top management team of a big multinational firm in class. They travelled across the Atlantic (as they are based in the UK) just to spend the last 20 minutes of class with us sharing their thoughts and answering to our grilling on a particular case (x3 different time slots, some in room, some via simulcast). Around here it's quite usual to get the case protagonist from time to time (at least every 2 - 3 weeks we'll get someone).

At the same time I met a visitor (a friend's former co-woker) who happened to sit on one such a class and was impressed with that. I had not given it much thought before, my assumption being that all schools would get different protagonists depending on their networks and such, but then someone pointed out to me that it was likely that HBS, given its involvement in writing the cases, was likely to get more such visits. Additionally, since it's one of the few schools which are 100% case based, it's more likely to be so.

The longwinded introduction leads me to the question: do you usually get case protagonists to sit in class? Would you consider that interesting?

L.