The Agility Peak is Merrell's cushioned mountain shoe, and the 5 pairs a 31 mm heel of FloatPro foam with a Vibram Megagrip outsole. The 6 mm drop and 5 mm lugs are aimed at rough, steep ground where you are out for hours rather than minutes.
It suits you if your long runs happen on real trails and you want protection under the forefoot on rocky descents. There is enough shoe here to see out an ultra, and the fit holds the midfoot tightly rather than leaving it room.
It is not a road shoe. Those lugs are loud and squirmy on tarmac, and it is not light enough to feel sharp in a short, fast trail race. Merrell has moved on to the Agility Peak 6, so colourways are thinning out.