I hadhave the carpal tunnel also. My walk behind and my Echo trimmers did the most damage and the severe pain got me to go with a hydro mower. For you guys having problems with Echo & other trimmers: Easy solution that will ease the effects is to adjust the handles on your equipment. I took the Echo (triangle) handles off & replaced them with old Makita (round) trimmer handles. I am now able to adjust my grip so that it is comfortable. If you can't find a round handle to use simply turn the handle that you have until you hold the trimmer with your hands in a more natural & comfortable position. CTS isn't from the vibrations, it comes from holding your hand in an unnatural position, which pinches that nerve that someone else mentioned. If you can adjust any equipment that bothers you so that your hands aren't bent at awkward angles you can avoid a lot of the pain. I used to get it within 2-3 minutes of picking up the trimmer and can now go for 20 or more minutes before it bothers me.