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No, not really. I haven't managed to build a time machine yet, hence 1 star off right away.
The 2nd star has been removed because the author, like many who write at this level, suddenly make vast leaps of imagination right where your own non PHD understanding on the subject starts to fail... so they basically cover the stuff you know well and then suddenly just blurt out something without any explanation.
For instance, ageing one end of a worm hole near a dense body, and then being able to travel into the past by traversing the worm hole. Really? Does that even work? I don't doubt time passes more slowly near dense bodies, but does the actual exit of the worm hole exist in the past? Or is it merely younger? I just felt some explanation around such suggestions would have been valuable as that is exactly where I struggle with these concepts. There must be maths to support it, but no mention of it at all is made etc.
A great idea, but in my view, just like Brian Cox on TV, they tell you all the stuff you possibly know already with lots of nice analogies, but then when it really matters, they quickly gloss over things in a single sentence.
I prefer this book slightly more than Brian Clegg's book by the same title. It introduces an essentially scientific view of time travel, and in that respect is easily imitated, and not entirely without merit. I found the content, because of the scientific view, somewhat boring and familiar.