Having been a round wound user (Rotosound & Elites mainly) for about 20 yesrs, I recently switched to LaBella Flatwounds.  I am converted.  They are not as bright as round wounds, the brightness I never really liked so I tended to change my strings less often than most.  I also find that I can play licks using flatwounds much quicker and slicker than before, and with no left hand shifting string noise.