I tried 3 apples at Ithaca Farmer's Market today, Zestar, Gravenstein and Discovery.
I did not know how close to ripen those fruit were. They were all small. Don't think the growers thinned their fruit.
Zestar - sour. Too tart for my liking.
Gravenstein- first bite a bit sour and followed by sweetness. Like it.
Discovery - sour and the texture reminded me of Red Delicious. Not my taste.
I know many people here like sour or tart apples. I don't. I definitely will want to have Gravenstein scionpwood.