Hi! I had the endobronchial valves installed just over two years ago, and I would highly recommend doing it. It's not surgery, so there is no down-time, no pain, no disability. It is a gradual process, over probably a month or so before you can really be sure you're feeling improvement, and not just wishes. I am a 73-year-old woman, and I went from using supplemental 02 24/7, to only sleeping with it, and using it to vacuum, or other heavier work. The improvement increases for several months, then levels off. I would encourage you to do it, if your doctor has cleared you and you meet the criteria.