I have the one Will reviewed, and have had it for years. I’ve used it on numerous occasions, including just recently. It has always worked for me. It has kept me dry, and it seems breathable enough. In general I find judging the breathability of a garment to be tricky, but I never felt like it needed anything in that department. I hike in the Northwest (Cascades, Olympics, Canadian Rockies on occasion) and it is usually cold when it is wet, so this may not be the biggest test of breathability. Then again, I’ve been in plenty of rain.
The only thing that is a bit of a hassle is pulling it on over the head. But they manage to save a few grams that way I suppose. But then again they put it back with a separate pocket. To be fair, I have used that pocket from time to time, and it is handy. Overall I’ve been very happy with it.