Some people say the arms are really long, but in my case they aren't long enough. I have a relatively high ape-index (not atypical for rock climbers mind you) and I find them short. Compared with Montane Echo and Black Diamond BDV, they are by far the shortest. They also are on the narrow side, which can be a problem with a layer under.

The fact that the outer shell (not a layer) doesn't have closure tabs or tight wide closures that hug your wrist (like TNF Apex for example), is a big miss in my opinion. Not only it makes the feel less "sure", but also allows for excessive jacket arm travel.

Overall, I'd still recommend it, given how light it is, the quality of the materials and zippers used, but in my case it's simply too short in the arms, so back it goes.

This jacket is light weight and super breathable. The fabric wears well over time and doesn't pick like other softshells. It is fitted so if you're borderline, size up. On the flip side, the arms are cut slightly long and are stretchy for great range of movement. The coolest feature is how the waist has a special drawcord so that you don't dangle two loops at your waist where things can get snagged. I like how it has a real zipper that never gets jammed and not the smaller toothed styles that most jackets have in this category. Most lightweight jackets are made to be disposable. Not this one!

very simular the ECHO . here is a reviw on the squall

http://rockandice.com/gear-reviews/shell-jackets/mountain-equipment-squall-jacket/

I received this jacket as a gift, and overall I am mostly pleased with its performance. I really like the material it is made out of, it is very breathable and light. I've taken it climbing a few times and it does a good job of keeping the wind out and keeping me slightly warmer than just wearing a shirt.
However, the fit of it is pretty different compared to similar jackets from other brands. I am a solid medium across the board for jackets, but the echo fitted snug to my body and was a tad short for my liking. The tightest region was in the arms. There is a bit of stretch to the material, but when I bent my arms it would constrict around my elbows to the point of being uncomfortable. I have pretty normal sized arms and have never stumbled into this problem before, so this observation was new to me. I was surprised that a jacket aiming for climbers would be so tight in that area. This was the first Mountain Equipment product I've used, and I would definitely consider sizing up if you want complete range of motion, especially while climbing. If that is taken into consideration, it is a great piece to add to the quiver.