I have been hiking and climbing for 14 years now and through the years I have had many experiences with altitude sickness. I usually start to get symptoms between 10,000 - 12,000 ft. For years I have been living with this and just chalking it up to one of the negatives of this passion of mine. It has been very frustrating for me, as I am usually puking my guts out and slowing the rest of the group down. This has also caused me to abort several summit attempts and sometimes friends have also aborted to assist me. I have always contemplated taking Diamox, but I never did because I did not want to put up with the side effects. I recently took a trip to the high Uintas in Utah and I decided that I was finally just going to try it. we camped the first night at 12,000 ft and all I can say is..WOW!! That was the first time that I can remember sleeping over 10,000 without getting sick. It made the trip so much more enjoyable and I was able to climb two 13ers without any symptoms of AMS. I have seen some discussions on this forum before where people have criticized the use of Diamox, but for me I will never go to altitude again without it.