Excellent issue. I understand how the villain who is finally revealed as DoppelClark can be a polarizing character choice to many readers considering to his long, yet underwhelming past as a legacy character in the Superman rogues gallery. But the backup story written by Paul Dine & drawn by Ian Churchill really sells it. The backup story is perhaps the all-time best backup take I've ever read because although it's limited in it's size & content, it flawlessly delivers a heartbreaking tragedy for such a classic character who's been there ever since the Golden Age. Action #975 is the best single issue Superman story I've ever read in my whole entire life.