I have bought cheap amazon heads and genuine stihl and i spend more time fixing the line than anything else what do you guys use? I can maybe use it on two trees and the line will be inside the head and have to take it all apart.
I've been using the same ones with commercial line at my workplace for many years with no problems at all.I use stihl 25-2 trimmer head with commercial grade line, only time I have issues is when the line has been in the head to long and it "sets" a tight coil while wrapped and dosen't want to feed.
I could never go back to pre cut pieces of string. Such a hassleEcho speed feed takes the win and obsoletes just about all other designs.
Their "rapid loader" is a close second if you like to pre plan your job and have a pocket full of precut strings.