I've read most of Mr Brown's output over the years, great escapism, and as you pointed out Storming Heaven exposed the US weakspot with regards to the use of Airliners as weapons (though not in the same way as 9/11). The flying sequences really give you the feeling you are there, and they are certainly a glimpse into what was/is possible rather then probable. Unlimited budgets play a big part in it as well...
Bloody good read though, and for those with an interest in military aviation a lot more rewarding the a Tom Clancy novel!