Fruit of the M-111 Tree

Has anyone had the fruits of an M-111 apple tree? Not a palatable apple grafted onto M-111 rootstock, but just the plain old fruits of that M-111 itself?

I was looking at tree I have whose graft didn't take, and while I have other plans for the tree, curiosity impells me to ask.

It's my understanding that the M-111 rootstock is a cross of Northern Spy and Merton 793, two fairly popular varieties of dessert apple. This would seem to suggest a bare minimum level of edibility at least. The attached photo is of an M-111 fruit--looks pretty tasty to me! Certainly not a crab apple, in any case.