I planted quite a few Dunstan trees. Some of the largest are just now starting to produce nuts. Let me start by defining Dunstan. Dunstan is the name of a specific hybrid between Chinese and American. With this definition, all Dunstan trees are grafted. Chestnuts are generally more true to seed than many tree species. Dunstan is also trade name of Chestnut Hill. They now sell trees under the trade name Dunstan that are grown from nuts of grafted Dunstan (first definition) trees.
So, to be clear, I started with nuts from grafted Dunstan trees, cold stratified them, and started them under lights using a root pruning container system. I then planted them in the field. I protected some with tree tubes and left others unprotected. The first year I planted was 2013. Some of the protected trees are now producing nuts. None of the unprotected “trees” are producing. I put trees in quotes because they are more bushes than trees. The deer keep them from forming a central leader. I doubt if they will ever produce.
I planted my trees for wildlife. Chestnuts are too high in carbs for my restrictive diet, so I have not tasted Dunstan chestnuts so I can’t provide any information there.
As for Allegheny Chinquapins, they grow wild at my place. I collected nuts and grew them in root pruning containers. They naturally take a bush form and produce nuts in just a couple years. The nuts are much smaller than chestnuts. I did taste one of them and they are quite sweet. They have one nut in each husk and are smaller than a marble. They are susceptible to blight, but unlike chestnuts, blight does not inhibit nut production. They respond to blight similar to how the respond to fire. They top-kill and then begin producing new shoots form the root system. It takes only a year or two for them to start producing nuts again.
A friend on another forum posted some pictures of ACs that he planted years ago that he got from the Wildlife Group. They are much larger trees than any on my place. I don’t know if it is location or if there is that much variety in phenotype.