My goto setup is a 9wt IMX with a 350 Teeny. I also have a 500 grain and a Teeny 550 on a 10wt IMX. The lines are chosen for where I fish and not for the rods they are fished with. I fish the fast moving Merrimack and almost never anchor up. These lines are suitable for this type of water. You wouldn't want to fish them in a shallow estuary or any slow moving shallow situation.