Its a good issue. As part of Gerry Conway's run on the FF, it's a pivotal moment. After months of separation and despair, Sue and Reed finally sort things out. And its not like Sue doesn't have choices or options in life; she didn't have to come back, let alone get wrapped up with Namor. For those unfamiliar with Gerry's work, his trademark is conflict and development. He killed off Gwen in Spider-man, so who's to say what he would do with the FF?
The real impact of the book is the ending.
Its a well crafted, thoughtful, resolution to the conflict...
I truly wish the lesson that Gerry was trying to teach me would have stuck in my head better when I had become married. I guess sometimes you have to live through things, not just read about them. The story holds significance for me on a personal level, but it had an awesome impact on me when I read it as a child. The conflict between the characters was pretty mature stuff to me. The good news was that Gerry had brought the FF full circle. They were reunited, but it would be issues later before Sue returned to battle along beside her teammates.
Rich Buckler and Joe Sinott did a bang up job on the art for this issue. Sinott made Buckler look a lot like Jack Kirby.
The next issue, the 150th anniversary issue would feature the FF and the Avengers attending the wedding of Crystal and Pietro. It would also become a big event issue, with the return of the Inhumans, and the menace of Ultron.
The FF during this era is comics gold for the most part.