Grafted Plants Suck!
That's being very blunt, but it's how I feel. I've planted many a grape vine and many a rose bush and BLAM!, the graft gets zapped by one thing or another. (Yes I planted my hybrid tea grafts at or below the surface like it says to).
Then the roots are great and send up a plant I didn't want. I have since replanted own-root grape vines, roses and fruit trees where I can find them. When I take out the root stock from a honkin grafted plant, it's doing great, but I'd rather have roots of the true species plant!
Why graft roses? Mass production very quickly?
Grafted grape vines in CO aren't really necessary because of phloxera, or specifically, the lack thereof.
Why graft trees?
Save your plants! Save your $$$! If you must by grafted stuff, tip in, take cuttings or do what you have to in order to get own root stuff going. You'll be happier in the long run!