The Hudson Shirt is quite genuinely one of my favorite things I own.
I skied in it a bunch last spring and it's a great outer layer for keeping it stylish on a warm (or even not that warm, thanks to 40g of insulation) ski day. It's also waterproof enough (8k) to keep the bulk of the water out if the weather goes tits up. Most of the time I've spent wearing it has been as a casual day to day, "the weather is looking a bit shitty but I'd still like to look ok" jacket. I've been rained on in it a lot (I'm from London) and it keeps you dry as long as you don't spend hours outside when it's pissing down.
It also looks really good. As in people regularly coming up to you and asking where the jacket your wearing is from good. Faction have done a brave thing by keeping their branding really subtle, it's a lot harder to sell stuff when it isn't immediately apparent to a casual viewer what a certain product is. But the trade off is the stuff looks better, more grown up. I'd personally say the result is one of the best looking outerwear lines out. They are putting their faith in the design and quality shining through, which to me is rad.
Which makes sense because the quality on point. I've probably worn it 100 days mostly as a casual jacket, 20-30 on snow and it still looks more or less new. For sizing reference I'm 5'9 and 135 lbs wearing a medium which fits me well. It's a slightly long but relatively slim fit.
Basically if you like the look of this jacket and of course, nothing is to everyone's taste, then I would 100% recommend it.