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I think it's probably very hard when writing a book like this to strike a balance with the right amount of mathematics. If you understand it, it's very easy to underestimate how much of a turn off it can be to anyone who doesn't.
I think the authors should be commended for including any mathematics at all, I would expect there would be a great deal of pressure from the publisher to leave it out entirely.
One thing I did find a little annoying was their failing to name the gamma factor in relativity equations as the 'Lorentz factor'. After explaining it really well, the book subsequently refers to it as 'the amount time slows down relative to a moving observer'. It would have been a lot simpler to just name it, and I doubt it would have confused anyone.
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