The producing tree I have seen seems to be of moderate vigor (its not a dwarf, definitely larger than Makok...tough to say how it compares to SW, I have seen inground Silas Woods that also put it past the "dwarf" size, too). The fruit are shaped more similar to Morena but a bit larger. Taste and texture, from the few I have tasted, are exceptional. It is very sweet with a caramel (I suppose you could say a cross between caramel and butterscotch) flavor base vs the brown sugar of most others. Stone cell content is very low with the texture closer to Alano.
Unfortunately I have not had the opportunity to taste more than a few and I dont have information handy on the origin.
Also unfortunate, I do know the availability of trees is not good. As fast as ZHPP propagates them, they fly out of the nursery.