Stoney S. wrote a review of Arc'teryx Accelero Jacket - Men's on February 14, 2011
Lightweight, breathable and very warm, this jacket is a very comfortable layer. I primarily wear this jacket while running and I don't even notice I'm wearing it. There's plenty of room to layer underneath and it doesn't hold smells.
It doesn't have many bells and whistles other than a small pocket on the left arm. I thought it was a bit pricey to have such few features, but it's still a great jacket and does exactly what it says.
My favorite features are that it's lined with bamboo and the sleeve openings have elastic to say in place on my wrists.