Wish I had more time to comment.
First, look for rescues, show-bred cockers seem to have more health and temperment problems. Of all my experience in cockers, the ones from show breeders averaged a few years less in lifespan and many more health issues.

Second, be prepared for people to cross the street when you come toward them, and be prepared for bad comments. Overbreeding a few decades ago ruined the temperment of many cockers and to this time period I'd have people telling me how aggressive my dog is (she's dead now), even though they never met her. I've rarely met a cocker that had any aggression, but people tell me all sorts of stories about "evil" cockers. I was at the dog park one day with my mom's cocker and somebody who didn't know it was my dog proceded to tell me that "that's the kind of dog that will bite you in the face if you stare at it." He then proceded to stare down my dog, what idiot stares down a strange dog. Pepper just wagged her tail and ignored him.

Kids and cockers are a great combo if they are trained right (the kids and the dog).

They will piddle. Possibly for life. Know this before you get the dog. I'd hate to see a dog dumped off because somebody didn't do their homework. Pepper stopped doing this at a few years of age, but many don't stop.

Playtime depends on the dog. Some are very happy, bouncy dogs. Others are lavery serious and aren't bothered to play for long. They may not be playful enough to keep up with another dog.