I think they are my favorite fruit for fresh eating…I have never yet managed to pick enough to want to quit eating. (But, the birds love them even better than blueberries, and I know why, they’re goooooooooood.)
The amelanchier x grandiflora or apple serviceberry hybrid is the one for zone 6, with the Saskatoons for farther north. I have a few wild amalanchier canadensis and/or amelanchier lavies on my wooded property. Seldom get to eat any of the fruit…worse than cherries…birds get 'em.