I ordered this rain jacket because I have the Columbia Ski Jacket and I figured it would be a great as that one...and it is!  I love it.  It's thin so you can layer up to make it warm or wear alone when it's not too cold out.  I wore it on a 40 degree day with a long sleeve workout shirt under it and I was warm enough to run errands.  If I had to stay outside very long, I probably would have gotten cold.  However, I was nice and dry the whole day!
Size-wise, it runs true to size.  And it has a nice big hood.