G, for my pennies worth......Go for it.......I had a great time in the RAF and if you enjoy travel, sports and some superb friends then you will too. They will pay for anything if you have the right attitude(Operation Beaver was a 2 week surfing expedition in Devon!!!), let you see places you might never get to again, I was in the Falklands for 4 months and enjoyed nearly all of it, even Christmas(Upland Goose for dinner!).
Even if you then decide not to go ATC, it will have taught you life lessons you may not get elsewhere. My transfer from RAF to NATS was easy and while I have a good life as a civvy controller, I would not change those years for anything.
Hope it all works out.