Fc90. It can handle overgrowth, but my straight shaft might be a little better. Any overgrown yards to a certain extent are edged with a weedeater. That extra speed makes a HUGE difference in the finished edge. Well... If you're OCD like myself. How many jobs do you do that have overgrown edges? I only experience this on some new clients that are switching from doing it themselves to a lawn service. Really not enough to sacrifice the comfort that a curved shaft has. Small lawns and reel mowed accounts are edged with a weedeater. Small lawns bc we save time by not switching machines, and reel accounts bc it makes the edge look tight. I always try to use the stick edger though. Faster and easier.