For me, i decided a couple of years ago i wasn't going to live in a Barrack Block and be a weekend dad, so any postings would need to be commutable. Then i got my LTD 14miles from home and i'm happy.
IF (and its a big if) i got offered promotion, i would want to stay on the unit i'm at now, but theres 1x SNCO Wpns job here, and thats moving to Cranwell (apparently) in the not to distant future, so any promotion would mean a posting, and therefore would almost certainly mean living in the block.
Financially, i'm on SDRP, so would get the 5% payrise on promotion then nothing for 4-5yrs. I'd also be paying accomodation, extra food, and of course the cost of travelling back home at weekends. The extra pension is negligable, although the gratuity is higher.
And thats before we even get near to thinking about the state of the RAF currently, with less people about to cover the jobs that need doing, longer and more frequent OOAs, the erosion of almost everything that once made this a great job.
Sorry, but for me, unless it came with a posting that suited me, i'd turn it down almost without a second thought.
In fact, even if it did come with an ideal posting, i'd have to think long and hard about taking it or not.