Looks like only a few DDs have stumbled on this so far - myself only by thumbing through the Difford’s book. Which is, of course, post of the reason for having a copy!
Eminently smooth and drinkable! The cognac and cherry produce a more mellow and rounded Manhattan. A new favourite Manhattan! Will def have again. Martell blue Swift (outstanding in itself), Wild Turkey 101, carpano and Bitter truth Cherry bitters, Worth revisiting with alternative ingredients.

I think I would call this a robust drink rather than a more genteel cocktail! I usually find Fee Bros. Cherry Bitters a bit confectionery cherry, but they work in this drink.