Some folks will tell you that every hunter needs a DD. In my view, that is not true. If you hunt a wide variety of game (upland birds, big game, waterfowl, etc) then, yes, this is a good breed choice. But, if you are a specialist, e.g. a duck hunter only one of the retriever breeds might suit you better. It is somewhat of a waste to just use a DD on quail and pheasants. Blood tracking wounded game is also useful work for a DD.
These dogs crave time with their owner. To leave one in the kennel for days is not a wise system. If you don't have time for the puppy, don't buy one!
Testing your puppy in the JGHV/German testing system is highly recommended but not required. I will guide you step-by-step through the testing process but I insist that, if you are going to test your puppy, show up prepared for the test! For a comprehensive guide to what all this entails, buy my book PRIZE I, on Amazon. Then, you will know what is required.
In my experience (with several hunting breeds over my lifetime), the DD is the most intelligent of the bunch. But, with that comes lots of responsibility on the owner's part; train, train, train. Give the puppy two years of your life and it will give you ten years of it's life in memories.
My goal for every puppy buyer is to provide them with a high-quality, well-balanced dog that can be hunted in a wide variety of terrain and weather on a wide variety of game.
I will say this: getting one of these dogs and getting involved in the tests,, our breed club has been the most rewarding hunting experience I have had. Not just the dogs but the friends made, the memories, and, yes the game bag have all been a rewarding hobby for me.