I had to take this tomato off the vine today, it split from the recent rains. The variety is called "porterhouse" somebody gave me a small pick of those seeds a couple years ago. This is not the biggest one of that variety in the garden, and I have several other varieties pushing the same size, also.
Most of the porterhouse variety, a hybrid, are badly deformed. Also, it does not seem to be very prolific, only a small number of fruit per vine. The taste is OK. The advertisements for the variety claim 2-4 pounds, I see a green one on my vine that will certainly go better than 2 pounds right now. So, if you want a big, deformed tomato, Porterhouse may work OK for you. I'll not bother with it again.
The next vines over are "Carbon" which I got from Martin, all nice, well formed and in the one pound range. At this point in time. I'd say the carbon is producing 4 times as much as the porterhouse, by weight. Of course, it's early and we had 108 degree days. BUT, both vines got the same weather. Of the 12 varieties I have this year, the Porterhouse is the least productive.