I'm one of those who often does marathons...hubby says I'm going to crochet my arm off & before I got ergonomic hooks, I often felt like I was. For me, it was find a better hook or live in pain cuz I wasn't about to quit (at least not in the winter). I tried the interchangeable sets & while I was happy with them for awhile, I found I was constantly tightening the connection so often it got quite aggravating.