We have several plants grown from seed from a 'Mountain Magic' tom, given to me two years ago, and they seem to have reverted to a very solid yellow fruit!
They're very hard, and don't seem at all bothered by the wet and cold we've had recently!
I'm watching them closely, as they are among the last of the San Marzano, which have been absolutely fabulous this year (they were recommended by many chums here, so we're very grateful), and touch wood, no blight here yet!
I suppose I must replicate the experiment I tried a few years ago, when I tried several 'Crimson Crush' plants from saved seed, and they definitely went into two camps - one was just fabulous, the other not so good! But we had the space on 'The Patch' back then...
Toms are such a staple here, I really cannot envisage a garden without them - the 65 plants we grew have given our chums enough for all the chutney in the village...
...for the next ten years...