It's an interesting experience. Sometimes it's amazing. Videos usually include different angles, so you might feel like changing your body's position (though not necessary). It's very different than watching porn on a monitor -- the performers can be 'in your face' (very close) which may be unpleasant to some people. It's certainly something worth trying with at least a couple of videos (some videos are 3rd person view which is nice). Pro-tip, consider VR porn with mind-altering substances (e.g. weed, MDMA, LSD, mushrooms).