I saw grafted tomatoes growing at a farm in Overton, TX a couple weeks ago. It's an interesting concept and I can see the benefits if you are having a problem with soil-borne diseases. Other than that, though, I can't see me doing it. One big issue is that they are much more maintenance-heavy plants. You can't let them sucker as you would regular tomatoes, otherwise the suckers that come out will be of the rootstock genetics. So all your plants have to be kept trim to just the one single trunk. That's a deal killer for me since I like to just plant my tomatoes in a cage and let it fill the cage up.
