Last year we apparently had perfect tomato growing weather. I had 8 plants, eight different varieties, one of them hybrid (Early G.) And all 8 plants produced well, 30-50 tomatoes each. The early girls were OK, but probably the least flavorful, they were not any earlier than a couple of the others and they were smaller than most. Prudens purple were the least productive, but there were still plenty of them, since I use them for fresh eating only.
I also start from seed, 6-8 weeks before planting out. I don't supply the neighborhood with tomatoes, but I do give away about 20-30 tomato plants.
I usually can't plant out until the first week of June - and don't get ripe fruit until mid-late August (its WI). This year we had a very cold wet June, and I have had to remove a lot more blighted leaves from the plants than last year, but the plants in general are looking healthy, with good fruit production and lots of new flowers right now. Kellogg's Breakfast has the most fruit on it so far. I am really really looking froward to my first BLT of the season.