I shortlisted a number of breeds based on the "write-ups" of breeds that I researched......I chose a cocker not because I had personal experience, but because I thought the characteristics that the books described would suit our family. The books were wrong; but none-the-less, we all manage to muddle along, most of the time
The behaviour the books describe that you highlight -
well behaved, not overally vocal and is happy to be quiet indoors but energetic outdoors - is not behaviour naturally adopted by many dogs, they have to be taught how to behave in the way you expect; sadly, many dogs find themselves homeless because these breed profiles lead to unrealistic expectations
What the books don't tell you about cockers is how distinctive they are as a breed - most cocker owners can identify the bark of another cocker, and I have been approached many times by people who say things like "Oh, you've got a noisy, mucky, selectively deaf one, too"
Of course all dogs are different, but cockers have, in my experience, a number of very distinct characteristics, that are not shared to the same degree by other dogs
Of course, other breeds have their own characteristics too (we have a beagle in our agility class
), but I think many people who have dog, but not cocker, experience, can be surprised at just how "different" cockers can be