Correct me if I am wrong but according to the John Sommnez Pluralsight Video are not channel stacks in WCF pretty much now deprecated or obsolete with Client Proxies.? The reason I ask is because I got grilled about channel stacks on a recent jobs interview by the architect. But I thought that line of questioning was bit off kilter by the fact that now they are using client proxies. I could not find a single reference to channel stacks in the advanced Professional ASP.NET 4.5 in C# and VB book. Care to answer this one anybody? Anybody at all?