My two Stanwells are now in their 4th season and basically eating my fence. But that was the idea :), so I'm very happy. Right now my shrubs share the fence with a few runaway vines of Clematis viticella in dark purple. A perfect match! For the Stanwell I recommend hard pruning in early spring. Prune too gently (or not at all), it makes weaker and weaker branches and twigs that will no longer carry the weight of the flowers. After hard pruning it comes back very strong. Although it is often listed as a two-timer, after a strong first bloom in late May, mine goes on and on with some ups and downs but never stops entirely, until the first frost and even beyond. I have given up deadheading it, it comes back all the same. Hips are rare, usually dry up soon. The color of the flowers varies. In cool weather they are a deeper pink that keeps longer. In hot weather and when flowers get older, they become more of a creamy white. As in the typical damask, fragrance is overwhelming in the early morning, then ebbing out until in the evening it's barely noticeable. Cut buds will open well in the vase. Although the flowers are quite short-lived on the shrub, when you cut buds they will keep for 2-3 days.

I question the old assumption that Quatre Saisons was the seed parent. The Mackie catalog for 1812, for example, listed other possibilities:

Four Seasons
Paestana
Portland
Monthly Red
Monthly Red Cluster
Monthly White
Monthly Blush
Monthly Striped

They also listed several China roses:
China Single Red
— Double Red
— Double Crimson
— Double Marbled
— Single Blush
— Double Blush
— Small Double Blush