Well it's nothing to be frightened of, but if like me you don't things being "done" to you, it can be a bit annoying. Some machines beep before they measure and I could feel myself getting agitated before the bag even started to squeeze, but on the plus side it warned me to keep still so I didn't have to do a second reading. Others are quiet and just rumble a bit when they start measuring. If the cuff feels tight around your arm you can undo it and re fit it, don't allow it to pinch too much or you might end up with a bruised area on your arm. In fact I even worked out the intervals to take it off and have a shower when I felt like it. Good luck.