Yes, I have the Shelter jacket and the SF Reversible jacket. The Arctic jacket is just the Shelter jacket but it's not waterproof.
The reversible jacket is very good, but it is only a light jacket; you would want 400g Ulfrotte below perhaps.
The Shelter jacket is very good indeed. It is waterproof (to a point; there is no hood and it is not designed as a waterproof jacket), and will keep out all snow and most rain. It is very warm. You'd only want this in the evenings or in your sleeping bag (The Nanok range are designed to go together as what is called the "tactical sleeping system"), or in the Arctic, as it will make you extremely hot even if you just sit in it. It's also ideal as a jacket to wear in the mountains when you stop to have a brew or to eat - this is why it's called the shelter jacket. It's also good if you're in trouble on the mountains and you use it in your survival bag.
Both jackets are well made and suitably hardwearing, and both get a big :biggthump from me.
If you've any questions don't hesitate to ask, I've used both jackets extensively.