Once I saw the title, how could I not get this book, honestly? And the ray guns on the cover sealed the deal, if the title hadn’t.
I think, ultimately, that the book itself didn’t totally live up to the title, but was pretty good anyway. It’s ostensibly about time travel, but really about a man and his relationship with his father, in understanding his father better.
Pretty meta, really, but good if you’re into that type of thing.
John's Blog 
I read this after Cory Doctorow recommended it on Boing Boing while traveling in Bali.
I must say, it was a bit too meta for me. I was hoping for an interesting read with time travel or the like. I’ve actively recommended against it to people.