Our guide, Philippe was awesome and friendly. He took plenty of pictures for both my wife and I, and was never annoyed when we asked for more or redo's. The whole experience was awesome with hot soup, snacks, hot dogs, hot beverages, etc. Just beware access to restroom/toilet is limited, so be prepared to hold bladder or go in the wilderness!
And the guides tried very hard to make sure we get to experience the northern lights. Although the density and activity wasn't very strong, we were still able to see some big bands and get good pictures. We appreciate everything the tour guides did and the fact that they send us high-quality photos via dropbox afterwards is outstanding service.
If you want to change dates due to weather concerns or to increase chance of catching it, they're very open-minded about that as well.