OK for casual/camp use, not so good for aerobic use
My wife got this jacket last season. She likes the fit and the look, but for aerobic activities it falls flat. She found that it breathed about as well as your average hard shell, but worse than her eVent shell. This was disappointing, especially as it is billed for "highly aerobic" activities. It's been relegated to casual duty only, and we're looking for a replacement to actually use climbing, hiking, running and cross country skiing.