I have had it done! What can I say, just as you all had said, it is bearable, lasted about half an hour, towards the end they put the contrast in which was the part that worried me, but nothing just a little bit flushed for a very short while, no sick feeling no headache. They played soothing music , the banging was rather loud at times but in short bursts, I tried to relax as much as possible and was complimented for staying so still. The best part was when they came in saying: "All done"! 