Too bad, I always liked his books.
I read Guns of the South twice. That was my introduction to “alternate history”. I ended up with about 15 of his books, all in hardback, and eventually just gave them all away. I got them at estate sales so I didn’t pay much.
The problem was that I just felt like I was being strung along. I just lost interest when a story that I though could have been covered in one - or maybe two - books, just dragged on and on through multiple books. The series about the Alien attack in the middle of WWII was really great for one or two books, though.
The amorality of his books also got to me.