Interesting enough but it does drag in parts. This (subjectively) suffers in comparison, I think, simply because I recently read Davies' The Last Three Minutes, which covered much the same ground and was really enjoyable.

In general, I've read a handful of Asimov's science books now, and sometimes it does feel a bit repetitive. I understand that in popular science you've got to start from the basics to ground your audience, but I feel like I've read something like the first chapter several times from him. And he does delight in explaining exponents, but at least here that's confined to an appendix.