Daniel Belzer wrote a review of Rab Latok Jacket - Men's on March 2, 2014
Familiarity: I returned this product before using it
Fit: Runs small
All, the sizing on this jacket is about what you'd expect in the arms and body length. The waist drawcord makes the length quite manageable, and the two-way central zipper is on the European side. I thought the fit and finish on this jacket was every bit the equal of Arcteryx, and the eVent breathes a ton better.
If, on the other hand, you are relatively muscular in the shoulders and have a long (side-to-side) back, you'll be disappointed by the amount of room in the arm pits. The back and chest fit well, the sleeves were true to length so far as i can tell, but the "arms up" cut of the arm pits leaves a lot of fabric remaining to bunch up and chafe with just a t-shirt on. I will size up to XXL despite being 5'8 and 195 with chest dimensions slightly under the recommendations (45" vs. 46"). Based upon how difficult I am to fit, i don't hold it against the manufacturer.
If this doesnt work for you, I'd recommend a serious look at Montane- another english company that fits broader-shouldered men better. Hopefully more of you will try Montane and encourage Backcountry to order more of their shells- if for no other reason than for comparison.
I found the hood on my Montane Superfly XT to be better than this one, but the wire peaks in both were excellent- just be advised that the adjuster cords for the hoods will dangle over your collarbones and the drawcords for the waist zip are inside the handwarmer pockets. The central storm flap was awesome in this jacket, as were the interior pocket details.
If you are a tall, thin, or have the typical wiry build of mountain climbers and endurance athletes, you may have found a winner.