I participated in their two weeks Madagascar expedition in the last summer, and it was indeed a once in a life time experience! We stayed in the dry forest in the Northern Madagascar for wildlife surveys, and we were offered the chance to explore different satellite camps. Starting early at around 10 am and ending late at around 10 pm, a day in the forest was including three wildlife surveys and a lecture time. It was tiring, but Madagascar is a wonderful place that you will fall in love with its rich biodiversity and nature that you will not resist going out into the forest. The most unforgettable time is on the last week, we went on a small boat in the middle of the night to search for Nile Crocodiles. It was just like some kinds of thriller in the movie, and it is absolutely safe.
I have met amazing people with the same passion to wildlife conservation, and the people working there were real experts in the field, especially for the indigenous people who have unbelievably amazing eyesight to discover and identify small animals far away.
And I love the lecture session that they gave, which avoid us from the burning midday African heat :D and through the lectures you would really understand why are you doing this and what change can you give, which is a pretty nice wrap up to your time in Madagascar.