In short (pardon the pun) you have the endurance of an English Pointer combined with the demeanor of a Brittany. I grew up hunting with my cousins English Pointers. Pointers are hard working dogs but very hard headed. My first two bird dogs were Brittanys because of this. I found the Brittany to be eager to please and easy to train. The best thing is they hunt close. The downside here in GA is the mild winters. The Brittany wears out to quick because of the long coat.
The GSP gives me the best of both. They are eager to please, they hunt close and have the endurance of a Pointer even with the mild winter( it's going to reach 70 here today).