They're _wonderful_. The closest I can describe it (and my wife agrees) is that it's like if watermelon jolly rancher actually was a natural flavour. But if you wait more than a day or two after picking they're not particularly good at all.
Maybe a John Gidley's Pearmain? ( https://www.fruitid.com/#view/1012 ) - but really don't know. Fruitid is great for fruit identification.
Grow an apple tree (several, actually, to pollinate each other) is what I'm saying I guess.