Finally had one ripe enough to eat yesterday, First time for heirlooms, They are very good compared to the other varieties but they sure were slow to ripen and not much to look at. Do yours get scabby looking ? This is a pic I pulled off the web to show the variety but mine had a lot of cracks and some got scabby from wasps biting into them I think . They had eaten their way into a couple earlier that I threw away. They were on the vine longer than any tomatoes I have tried.
we've been eating them for over a month now I think
yes - they are typically grotesque, cracked, large, misshapen. but they are absolutely delicious. one usually has to trim quite a bit of scars/crevices/BS off but it's worth it
right about now though they sort of just "stall out" and go into suspended animation ripening wise - and to me they start to taste just a shade musty as if they are breaking down internally - even though they look fine
so it seems to me you maybe got short-changed on the heirloom experience.
full sun and a hot location seems necessary for heirloom tomatoes for us in Fargo - while modern tomatoes seem fine in any semi-decent spot (heirlooms are dinosaurs I guess?)
next year we'll plant all our tomatoes up against a sunny brick wall on the south side of the garage if I have anything to do with it
don't forget to place the slices on a paper towel or dish towel after slicing so they can drain the excess juice. in our experience heirlooms are so juicy they'll quickly slop up your tasty BLT if one doesn't do juice management first