I used this jacket for field work in North Greenland, where temperatures were around -15C (+5F). I have not been cold at all. I'm a girl, 5'7, and bought an M.
With warm base layer and thick fleece (MH Monkey fleece) underneath, I could sit by -15C (5F) all day without getting cold (not much wind though..).
One of my friends had bought the Mountain Hardware Sub Zero Parka, so I'll compare both to help you choose:

- Greenland is slightly warmer. It looks bigger, also. However, none of us was cold.
- Outer fabric of Sub Zero looks more sturdy. It has reinforced material under the arms and over the shoulders. However, I was carrying metal trays that were not properly deburred, and scratched my jacket many times without ever poking a hole through it, so I would say that the outer fabric is more sturdy than it looks. If you are looking for a solid outer shell, go for Mountain hardware, though.
- The very large pocket inside is definitely a plus: the MH jacket does not have a large pocket inside the jacket. I really loved having one: I can fit the camera, a spare pair of gloves, a beanie, the VHF radio, and there is still room! Since everything would freeze on the outside, I find it really useful (although it makes me look fat on the pictures..)!

In a nutshell, it is a very warm jacket, well built (although the outershell seems a bit weak). I have not found cold spots, and trust this jacket to keep me warm until at least -20C (-5F), even when windy. For colder temps, I have a secret weapon: there is room to put a down vest under it. Did I mention that it feels light, and it's very easy to move around in it?

I bought these pants to do polar field work in Greenland.
They are not what I expected, but worked very well.
They are lined, and quite heavy, which makes them warm, comfortable and sturdy. I did not manage to get them scratched, and they definitely will last longer than a simple 3-layer gore tex shell. However, I would not use these to go mountaineering: too heavy, bulky and not stretchy.
I think that they would be very good for downhill skiing/snowboarding though. With a thin liner underneath, you'd be set!

2 great things about them:
- on the sides, there are velcros to adjust the waist: It is very useful! Depending on the weather, I can put more or less layers, and adjust the size of these outer pants. The max I have put under are slim liner, fleece pants and primaloft pants. It fits!
- The pocket on the right leg is large enough to contain a 2x5 notebook, pen, knife.. All these really useful things when you are outside for work.

Bottom line: these pants are very durable, and great for people who spend a lot of time outside, but they are not a light weight mountaineering shell.