Ball links are great on the throttle only.I use the quick fastners and never had a problem,but prefer the E/Z Link by Du-Bro, or Snapper Keeper by Goldberg. I throw the sleaves and intersleaves in the trash or use on the throttle only,to much flex even with 3" supports,I use the Sullivan control horns on planes 120 size and smaller,medium on the SE,any thing in the control system that can flex or bend will,if it bends under a load you will lose that amount of control, as far as price and quality? Depends on how hard you fly and how much you enjoy rebuilding.