Pretty interesting...
Made a lot of sense to me.....
I didn't read this book, but I read the one by his 'partner' (Bob Cornuke, Mountain of Fire), and I agree that their conclusion is compelling. The mountain top looks like it was burned with fire, and there are other features that line up to the Biblical account.
Also, as someone noted, the Arabs have long called this Mountain, 'The Mountain of Moses'.
So I'd have to agree that the likely site of the Mountain of Exodus 20 is the one in Saudi Arabia (Mt. Jawal - or whatever they call it).