Ferris zero-turns are often chosen specifically for ride comfort-suspension reduces fatigue on bumpy properties and can help maintain speed without bouncing. A representative new price for the 300S tier is based on current dealer pricing for a new Ferris 300S (mid-$5k range), while IS700Z-class machines are typically much higher.
For the "suspension shock leak" scenario, repair is usually the best move when the mower is otherwise solid: replacing leaking shocks, inspecting bushings, and verifying mounting integrity typically stays under the 40% threshold and restores handling. Replacement becomes more attractive when suspension leaks are accompanied by high-hour drivetrain wear, multiple hydraulic leaks, and deck/spindle fatigue-especially if you're approaching commercial-use hours.
Consider your terrain: if you bought Ferris for suspension benefits, keeping that system healthy is a high-value repair compared with living with a harsher ride or losing cut quality from uncontrolled bounce.