Fred, it is not just vegetative habit that is changed. Flower set is increased. If you want more details, Kctomato has a few lines with this gene and has made several crosses.
I found a different but much more useful set of genes that sorted out in the Big Beef X Eva Purple Ball cross. It results in 50% higher production on compact indeterminate plants. If you want a few seed to trial, send me an address and I'll put them in the mail. I've described the results of using this line a few times. Short story is that I picked 80 pounds of tomatoes from each F1 plant in my garden. The effect holds in most crosses I've made over the last 5 years. I'm growing out Aunt Ruby's German Green X (BB X EPB) this year in an attempt to stabilize a green when ripe with the enhanced fruiting genes.
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