I regularly use my NTO combined with my F1250 for:
1. At Virgin check-in use the Premium Economy desk which is usually quieter. The staff say its because they recognise our need for privacy????
2. On arrival in the US use any queue you want Oh and you won't need the green visia waiver form.
3. When going through the security screening at Washington Dulles flash your NTO and you won't get selected for the full shoes off, body search. When I went through, the supervisor told the searcher to leave me alone as 'He might be carrying'. I was, 2 days dirty washing!!
4. My NTO also got my luggage upgraded to Upper class although I remained in cattle. The girl at the desk said it was the least she could do for the HM Forces. It did mean my bags were off first which combined with para 2 saved loads of time.
All that from a form that you can download off the intranet.