Bottom line This is a sung, race-fit jersey that works well on hot (i.e. sweaty) days.
I'm a Louis Garneau fan - the products are typically well-made, reasonably priced, and the sizes work for me. I'm not a fan of black jerseys, but tried this one and found it works. I'd prefer a brighter color for road visibility. I've wondered if the dark pigment absorbs more heat than a lighter one while riding up hills in typical Southeast PA August heat, but the rapid dissipation of moisture on the flats and downhills makes the point moot.
I don't race anymore, but ride hard and at least 20 miles each outing 4x or more per week.