What is your current cable wired for?
There are a few considerations.
If you have a device that requires clean csync then yeah you'd need it. You would know if you needed that since you wouldn't get a signal otherwise. Alternatively you could just get something like a sync strike with an LM1881 built on to get csync from any kind of sync cable and not worry about it.
Otherwise,
If your cable is wired with luma as sync, it's not worth it.
If you have composite video as sync it may be worth it. With good shielding in the cable composite video sync should be fine as long as your TV/scaler are built with good sync separation. I know the framemeister doesn't have this, and composite video as sync can lead to some weird checkerboarding artifacts so in that case it's recommended to have some sort of sync cleaning (like
this adapter with the lm1881) before going into the scaler or just using sync-on-luma or clean-csync-as-sync.