I wear one. Has decent venting, pit zips, rear vent. The zippers are very small which prevents rain from getting in but I don't like small zippers. Too hard to open with gloves. It is a good windbreak. Keeps me dry from the rain. I do sweat in it, though less than others I've tried(not tried many). I only paid $40.00 at a bike show in Maryland. I don't think you can beat it at that price. Does it compare with Showerspass?? Can't say but am thinking about asking Showerspass if I can compare their brand to mine. If there's is significantly superior then I'll buy it if not I'll return it.
FWIW: Aqua-no is decent but not perfect.