Last week I did a 100 km section hike of the Grande Traversée portion of the IAT which traverses Parc national de la Gaspésie. The trail was a bit damp, but pretty well maintained.
As some others have noted on this forum, it costs about $20/night to spend the night in the shelters. However, it should be noted that these shelters are absolutely outstanding. They are more like cabins in the woods, enclosed on all four sides, beds have a vinyl encased mattress, furnished with tables and chairs, and containing a wood stove...with firewood provided! In principle you need to book a spot in these shelters in advance, but for a section hike this is ideal....no need to carry a tent or sleeping pad.
Views in the Chic Choc mountains are outstanding...
Can't wait to return in the future!