was disappointed by the boxy shape -- wide at waist, then hit awkwardly & tight at hips. i'm a small but went with medium -- I recommend sizing up 1 from your normal size if you plan to be able to wear another slightly bulky layer, like TNF osito or packable down jacket under this, which is why I got M. the small was too snug for mobility with the extra layer.
if you can get this at a killer deal, totally worth it. this is a great lightweight packable jacket with pit zips to get the job done keeping you dry and not overheating. however, if the price is the same as the marmot precip, i went with that instead for the following reasons: a more fitted hourglass silhouette, longer coverage not binding at the waist, fast elastic adjusters instead of velcro, and most of all, the ability to fold down and stow away the hood (you're stuck with the hood flopping on the venture.) the precip is also slightly less 'whooshy' fabric than the venture.