My 2 WCS Murphy and Indy are both intact. The training classes I take them to are very keen on castration, and to be honest I feel a bit pressured to have them done. At the moment I'm standing firm and leaving things as they are as Indy is only 8 months old, Murphy is 20 months old and isn't the most confident cocker and when I mentioned castration to the vet she advised us that in many cases castrating an anxious dog can make matters worse. Neither of them have any medical problems or issues apart from a bit of anxiety with Murphy when in certain situations which I can control, so I've decided to leave well alone for now.
On the subject of chemical castration, both of my CKCS have had Tardac injections (chemical castration) in the past, one for prostrate problems which worked for a while, and the other for anal adenomas which also worked for a while. Eventually I had to have them both castrated. Harry's coat changed very little but Chester's coat went wild.