Aaron Morse wrote a review of Marmot Sidehill Component Jacket - Men's on March 6, 2014
Familiarity: I've used it several times
Fit: True to size
I'm a slightly slim 5'10, 160lbs and got the medium. Fits perfectly. With a somewhat thick sweatshirt underneath it fits a little snug but not too tight to be uncomfortable or restrict motion. I looked at a few more expensive jackets but glad I decided on this one. Price, fit, features and quality are great.