this jacket is my bsolut favorite, i use it for everyting, fomr going to the grocery store to climbing in patagonia.
supper lightwheit, compresible and warm (considering tis size and weight)
the great thing about it is that it packs down to nothing and you can clip it to your harness and not know its even there.
most of the times i use it as an outer shell, but in many ocasion i wore it as a second layer when it was really cold.
the only downside is that its not the most durable. but it is the price to pay for a lightweith jacket.