mglskikid wrote a review of Patagonia Houdini Full-Zip Jacket - Men's on July 10, 2014
Familiarity: I've used it several times
Fit: Runs small
At 5' 10" and 120 Lbs, a size Medium has longish arms but provides ample room to layer. Fear not though, as the cuff with half elastic and half static material is perfect to pull the sleeve up your forearm, securely, albeit your arms are the fleshy impersonation of toothpicks, (like mine might be).
Everyone knows this jacket has fantastic wind resistance, and will hold the heat in, while also not getting sticky and gross when you break a sweat, but I think it's waterproofing is under appreciated. "Pro tip:" If you layer the Houdini with wool or other great thermals, the jacket can take a HEAVY DOWNPOOR, and keep you dry.
I recently did 35 miles in an all day, most of the night Long Trail extravaganza, and was very pleased by the Houdinis comfort, versatility, small profile and durability. I know, durability, what is this? But it's the thickness of a garbage bag on a diet? Do not worry, even after shimmying over some rocks, the Patagonia Ironclad Guarantee shines through, and the jacket looks perfectly new.
All in all, highly recommended, and I frankly could not be more stoked.