I have been very happy with 'Winter Sun', although the clusters are only 1/3 or 1/4 the size shown in the ads. Also, I expected flowers by Thanksgiving or Christmas and they are just really yellowing up now. The new foliage is all sorts of opalescent muted shades of bronzes, purples and bluish greens, so the plant is worth growing for this alone. Rampant deer and rabbits have never touched any of my 4 different types of Mahonia.
Edgeworthia is unique in its appearance and I am tempted to try other sorts of this plant mentioned on the web, including the more difficult and tender red flowered sort.
Your sort has been trouble free here, also.