I won't say the taste is entirely different. A tomato is a tomato after all. But the taste is entirely different. (Oops, I wasn't going to say that.) Little of that "green" umame taste, and more of the tasty tomato taste.

I also get a kick out of eating a brownish, purplish, green streaked fruit. Heirlooms are fun.

Other than "Great White" and "Goldie", the tomatoes I grow would probably be unrecognizable to most. "Sojourner South American" is a very large (averaged 14 ounces) red oxheart with few seeds, and a wonderful flavor. "Nicoviotis Orange" is a bright orange mid-sized tomato with a really sweet flavor. "Federle" and "Gilbert's Italian" are large banana-type pastes (up to 8 oz.) that are also really good chopped in salads. "Elfin" is an open-pollinated grape tomato, with thin skin, meaty texture, and a rich - but not overly sweet - flavor.

There are so many wonderful varieties out there that it's impossible to try them all. The differences really come out when you taste a lot of them side-by-side. I attended the Seed Savers Exchange tomato tasting event over the Labor Day weekend, and found a couple ("Gold Medal" and "Red Fig") that really impressed me with their flavor. They are on my list for next year!