It depends a lot on ones defintion of "worth".
If your fuelling etc were perfect(for max power) you would not see any gains for a lot of money, if as is very likely they no longer are perfect for max power, as ford do not write programs this way you could see a very noticeable gain certainly in driveability, may only be 10 bhp(example) but is it worth the outlay, that is up to you and your wallet.
tabetha