I was also originally hesitating between NPSIA and Munk, but was really disappointed with my personal experience when I visited Munk. Not living anywhere close to Toronto, I wanted to use a visit to the school before the actual results were out to get a feel of the program. I messaged both the MGA administrator and the MGA Student Ambassador Program twice, two weeks ahead, to schedule a tour and did not hear anything back from either of them. When I finally ended up getting through to the office, I was told that the students were particularly busy (which is completely understandable) and basically not to bother the administration, but that "I was free to look around in the basement and public areas and to come back for a tour when I was admitted."
The one student that I did manage to briefly chat with raised a number of red flags that I think are worth mentioning. They cited the fact that there was no opportunity to work with professors, and that they didn't find the classes to be intellectually stimulating compared to what they had done for their undergrad. Given that tuition itself is close to $40,000, I was really shocked to hear that the class sizes are close to 40 to 50 students per class in lecture format (and without much of an opportunity for smaller seminar classes). The program claims to be pushing itself towards a 'professional orientation,' but many of the classes were described as overly broad and disorganized. Also, I should mention that I didn't get the friendliest ambiance from the students in the program when I was there. Not sure whether it was a case of 'Trinity College' arrogance, but that was my initial impression.
This isn't to completely sway people from the MGA Program. I am sure that there are a lot of positive aspects to pursuing a degree at Munk, and Toronto would truly be a wonderful city to live in. However, I did feel that people reading this should know about it.