Beef Heart Tomatoes!

I've never grown a heart shaped tomato. I've noticed a few people grow what they call beef heart tomatoes. The few photos I've seen have a lot of tomatoes with some hollow gel cells. I'm curious if the beef hearts are grown primarily as stuffer tomatoes. I also noticed a lot of the seed sold for beef hearts don't really have variety or cultivar names. They usually label them as a beef heart from Germany, or from Holland, or from Portugal; but they often look very much alike. Just curious!

Ted