It's fustrating to buy a set of commentaries Like word Biblical Commentary and not be able to easily identify what volumes need to be added or updated to a newer verison.
It's also fustrating when you call in for a version upgrade and a sales person tries to sell you a commentary set you already have. I tried to tell him several times that I had actually bought it twice. One I gave to a friend when a newer set that was more complete came out.
