I bought the R4 jacket back in 2007 but I had another Marmot fleece to wear that I have traded in for this.
I only really started using the jacket last fall since I had some other jackets - in addition to the Marmot - that I preferred.
People keep asking me how a fleece can be warm but this jacket has some Polartec WindBloc laminate between the mesh on the inside and the fleece on the outside.
I've already used it for skiing and can't complain to it's effectiveness on the slopes.
It definitely works for Colorado winters.
There you go - a commercial endorsement on this mini blog.