I've got a pretty good grasp on cocker spaniels and what they are like having lived at mums for 8 years with 3 cockers of varying age.
Oldest, golden cocker spaniel, 8 years old so getting on a bit but still full of energy and 'go' and will run and run every single walk she is taken on. She has a typical red head attitude and a bit grumpy and will growl when food is involved. Has bitten me once in 8 years.
Middle, a tri-colour cocker spaniel with ginger eye brows (she's ugly as f really) and then just a mish-mash of black and white. She is docile as anything, has never bitten or growled in 6 years and is a little on the fat side as she just plain refuses to run unless there is wildlife involved. Loves the bath so much so she will get in with you...careful on this one, ha! Running jump across the landing, splosh!
Youngest, a black and white one with real show cocker trot and stance but is thick as 2 short planks and absolutely mental. 4? years old and is easily half the size of the other 2 fully grown, quite a funny little thing really. She has also never bitten or growled at anyone other than other dogs but given her size this is just comical. This one will also run for days but due to her dopeyness tends to run into things, vet trip one time for running into a barbed wire fence...
I also have an 11 month old daughter and have no hesitation in allowing her and the dogs to play together in the house. I absolutely hate the bad press cockers spaniels get because it's 'usually' bad press from people who have never owned them and these 3 have been a part of my life for total 8 years now and only the eldest has bitten me once. Kind of gives you an idea doesn't it? Or not, no cocker spaniel can be compared to the next because every single one has such a great personality. Do it!
Hope this helps and I would definitely recommend them as a family pet. At the end of the day, they are the best looking out of the cockers aswell, working cockers are so big headed!