WCF - advantages and disadvantages

Question

I would like to find out about BOTH advantages and disadvantages of Windows Communication Foundation from people who have used it or just know it theoretically.

Answer 1

I found it very easy to set up and learn. I had a web-service running in a few hours without any experience using WCF. I can do it in a few minutes now.

The downside of this is that I still know next to nothing about webservices. This can turn around and bite you later. Its very easy to make the wrong design decisions based on incorrect assumptions on how things work. It's very easy to maintain state in your service classes for example but this will cause scaling-problems later.