Hi Stephen
I bought one of these just before Christmas and used it during all the cold, snowy weather we had over the new year. Both on and off the mountains.
It's a nice jacket and works well, however I did find that the sizing was a bit on the small side. I normally take a size medium in 95% of the outdoor clothes I buy but I found this jacket to be a little tight around the chest area.
Every where else it fits perfect, the sleeves are just right as is the length of the jacket but maybe 2 inches more room around the chest and it would be perfect. Just to say I have a 40in chest so I'm an 'average' size medium.
I have worn the jacket over a base layer and an Arcteryx Atom Hoody and found it has just enough room to loft up.
I couldn't try the jacket on before buying it as I purchased it online from a shop in the UK (I'm in Ireland) and I presumed that a Medium would fit ok!!
If I was buying the jacket again I would get a size Large, so if you are considering this jacket either try it on first or think about buying a size up from your normal size if you want to wear a layer or 2 under neat it!
Any more questions let me know.
Cheers
Paul