I used to hunt 4 days a week when I owned my Brittany, I hunted Pheasants and Quail and never had more fun hunting. Upland hunting is not the same without a good dog.
It's a total game changer and as others have said, watching a good dog work, is a sight to behold. It's more fun than shooting the birds, actually.
Lesson number 1:
ALWAYS trust the dog. My pointing lab (RIP) made me look like a fool a few times until I learned to trust that she knew more about the hunting situation we were in than I did.