New Toro T5 rotors are awesome. Best money I've spent.
After my lawn guy killed a couple of my Toro 600 rotors with his aeriator last fall, I needed some new rotors.
Last night I installed a new T5 and all I can say is WOW! This unit is a million times easier to setup and adjust than my old 600s. Even swapping nozzles is easy. The arc adjustment is one hole in the top, the spray is another, and there's a third hole to lift the rotor. All the holes are under a rubber cap. Since some of my old toro heads are installed a bit too low, I plan to install more T5s for the extra height.