I've just put a set of flatwounds on a semi-acoustic and I just LOVE em! The guitar now has THAT jazz tone, the one I've wanted. I'm in heaven!
The trouble is, it seems to me like they fatigue quicker than round wounds. I took the strings off to mess with the pickups, and snapped the ends off when I tried to straighten them. The third string (024 wound) came apart - as I tuned up, it kept slipping and eventually the string broke, as if I had pulled it apart.
Is it common for flatwound to fatigue like that? I tend to tinker with my guitars quite a bit, and the thought of loosening strings and tightening them at the risk of breaking them is a bit scary. Expensive scary.
The strings I'm using are Curt Mangan 11-51. I think I'll switch to Rotosounds, though.
Richard, what's your experience with flatwounds?