First, I love interchange/3-in-1 jackets.  As someone with two active dogs, I need to be outside in all weather in order to ensure that they're exercised adequately.  3-in-1 jackets allow me to have good protection against cold as well as wet, and give me some flexibility for the weather.

Pros:  The jacket has lots of pockets.  I might wish for larger cargo-style pockets (better for dog treats/toys), but overall I am happy with the number and location of the pockets.  The collar zips up high around the neck, which is wonderful for when there's a brisk wind out on a cold morning.  The detachable hood is excellent at keeping the rain out of your face on very wet days.  Also, and here I cannot emphasize how important this feature is, the jacket comes with pit zips.  Even though it can be quite cold outside, if you're engaged in strenuous physical activity, you're going to get warm and sweat.  Perspiration is a killer in cold weather, since when you cool down, the moisture will make you feel colder.  Enter the pit zip.  You don't really want to take your jacket off in single digit weather, but you can vent a bit with the pit zip.  Also, the price on this jacket is very good.  I looked very hard to find a 3-in-1 jacket with as many features at an affordable price.  The Whirlibird is hands down the winner here.

Cons: I wish there were a dual zip so that you could zip the jacket up, and then unzip it at the bottom so as to reach in your pockets more easily.  Also, I wish there were a good-sized cargo pocket.  The interior pocket could be larger, too.

Other:  Many people have commented on the fit.  It's true that the jacket feels snugger than its size, but this is because it has a very close fit, not because it is sized small.  Most people are used to looser clothing, but high tech cold gear does tend to be more form-fitting--and a close fit helps keep the cold out!

Bottom Line:  I would recommend this jacket to anyone.  My last Columbia purchase nearly made me swear off Columbia products, but this jacket has been an excellent purchase.