It’s got all the features you’d expect in a high end mountain jacket. The hood fits over a helmet, The two way zipper is water resistant and baffled and you’ve got really good sized chest pockets. Hem, cuffs are hood are all adjustable, giving plenty of scope for tweaking ventilation and fit. The fit is fairly athletic, so, I’d try sizing before you buy but the stretch of the fabric does allow uninhibited freedom of movement.
My only performance concern is regarding durability, especially if used regularly with a heavy pack. The Eco-Shell just doesn’t feel as robust as some other technical waterproof fabrics. I might be doing it a complete disservice here, Fjällräven certainly seem to have given it some stick during R&D, but I haven’t yet put it through some serious pack abuse and only time will tell.
It has taken a few scrapes against drystone walls and gritstone and, to be fair, it’s remained scuff and rip free. I’ll get back to you on this after a Peak District winter and some decent pack time.