I have had two Cockers in my lifetime... I currently have a parti color named Sam, he's in my signature.

They are one of the most wonderful breeds, in my opinion. They LOVE people, they thrive on attention. True to their hunting dog heritage, they love the outdoors and cannot be cooped up in the house all the time. Both of my Cockers have been wonderful with other animals and dogs. They are content to sit on the couch with you and snuggle, or go out and be active with you. Seperation anxiety is common in the breed so it would be best if you didn't work all the time. They need at least a half hour of outdoor activity if not more a day, whether it's playing fetch or going for a walk. Potty training has proven to be a little more difficult with my cockers than the other dogs I've owned, but as long as you have the time it can be done just as easily as other breeds. They've got long, silky coats so they need to be brushed daily and need to be groomed frequently. They are wonderful with children, as long as the children are respectful with them. The long ears that Cocker Spaniels have are prone to ear infections, Sammy (my cocker) has already gotten one at 11 months of age. To avoid ear infections, clean his/her ears with cleaning solution about every two weeks. You can find it at your local vets office.
Cockers are more sensitive to correction than other breeds. If you correct them by yelling at them, they may start to pee a little when they are excited or frightened. It's very common in this breed. Sammy had it when he was a pup, but he eventually grew out of it, many dogs do.
Make sure you get your dog from a reputable breeder or shelter. Fear aggression and rage is common in BYB/puppy mill Cockers. My parents got Missy, my RB Cocker, from a BYB when I was 5. She had horrible fear aggresion her whole life.

Hope you find the perfect dog for you! Cocker Spaniels are a wonderful breed for the right person. Good Luck.