Yep - gotta love the one sided propaganda on how great life is on an overseas tour.
What is not mentioned is that you will be expected to live in a house far smaller than you would have in the UK because the rental allowance is so small. Your neighbours will work on the tills at Wal-Mart or be receiving unemployment benefit because, that's the kind of neighbourhood you will find yourself living in.
Your kids will be in sh1t state schools and you will just have to accept it because MOD will not pay for anything better. Your wife will almost certainly not have a job and the allowances will not cover loss of earnings. In fact, the allowances will barely cover the extra insurance you will have to pay for the privilege of driving a car at the same insurance rate as an 18 year old.
What else? Plenty but maybe Whenurhappy may wish to add to the downsides of an overseas lifestyle?