Speaking to some mates who have just done the enhanced IRT course (aircrew and ground branches) they all said the course was good value and set them up well for their forthcoming dets.
But let's get this into context. The enhanced course is only for those who will routinely operating outside of a "safe" area. So, if you are flying in/out of Basrah/Al Udeid/Bahrain, you don't need to do it. But if you are wandering around outside of Basrah, going to Bagdhad etc, you will do the course. At the end of the day, the insurgents don't care a stuff if you are aircrew - a pair of wings will not stop the bullet - and if you are likely to be "out and about", some extra training may come in handy!
Sure, there are some anomolies to sort out, such as CCS currency but I think you will find that most people believe that we ALL need basic military skills - flying an aircraft does not exempt you.